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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
CC: "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>
Thread-Topic: [Roll] Review of draft-ietf-roll-nsa-extension-02
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From: "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>
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Date: Mon, 1 Jul 2019 16:10:00 +0200
Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Subject: Re: [Roll] Review of draft-ietf-roll-nsa-extension-02
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Hello Pascal,

Noted, we will updated it accordingly.

many thanks,
Giorgos


> On Jul 1, 2019, at 15:57, Pascal Thubert (pthubert) =
<pthubert@cisco.com> wrote:
>=20
> Hello Remous
> =20
> maximizing packet delivery rate and minimizing latency and jitter."
> =20
> The goal is to optimize packet delivery within bounded latency. For =
some flows the controller can also minimize the latecy but only a few. =
Think of an ambulance with all the green lights as it traverses the =
city. Other important vehicles e.g., police, will have to wait more. =
Minimizing jitter can be a secondary goal, not always.
> =20
> =20
> =20
> "As an example, to meet this goal, IEEE Std. 802.15.4 [IEEE802154-2015 =
<https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-IEEE8021=
54-2015>] provides
> =20
> Please use dateless reference unless you want to quote a particular =
text or section that may move or go away in the next respin.
> e.g.,
> =20
>       <reference anchor=3D"IEEE802154">
>          <front>
>             <title>IEEE Std. 802.15.4, Part. 15.4: Wireless Medium =
Access
>             Control (MAC) and Physical Layer (PHY) Specifications for =
Low-Rate
>             Wireless Personal Area Networks
>             </title>
>             <author>
>                <organization>IEEE standard for Information =
Technology</organization>
>             </author>
>             <date/>
>          </front>
>       </reference>
> =20
> =20
> All the best,
> =20
> Pascal
> =20
> From: Roll <roll-bounces@ietf.org> On Behalf Of Remous-Aris =
Koutsiamanis
> Sent: vendredi 28 juin 2019 17:45
> To: Routing Over Low power and Lossy networks <roll@ietf.org>
> Cc: Georgios Z. Papadopoulos <georgios.papadopoulos@imt-atlantique.fr>
> Subject: Re: [Roll] Review of draft-ietf-roll-nsa-extension-02
> =20
> Hello Diego,
> =20
> thank you very much for reviewing the draft and for providing us with =
your feedback.
> The issue of scope also might concern Rahul as well, so I have CCed =
him as well.
> =20
> Responses follow inline.
> =20
> On Wed, Jun 26, 2019 at 1:56 AM Prof. Diego Dujovne =
<diego.dujovne@mail.udp.cl <mailto:diego.dujovne@mail.udp.cl>> wrote:
> Dear all,
>               My review of the draft below:
> =20
> - The abstract should include more details about the purpose
> of packet replication and the context where the metric will
> be used. Is it an Objective Function? Is it a new mechanism?
> =20
> As you guessed and as you said in another of your comments further =
below, the scope of this draft may need some clarification. Up to this =
point, the from feedback that we have received and from discussions with =
others, we took the path of providing some introductory material as well =
as examples of potential uses of the Parent Set information in an =
Objective Function.
> However, and this is the main point, the draft only specifies the =
information to be transferred, its encoding, compression, etc. How =
exactly it is to be used (Objective Function) is outside the =
specification. The options are to:
> a) Create another document with the operation of an OF which uses this
> b) Extend this draft with the spec of an OF that uses the information.
> =20
> Since there is already work by Rahul which might take advantage of the =
same information in a different way, we chose a).
> Rahul, any comments?
> =20
> In any case, do you think that=20
> "This document details what information needs to be
> transmitted and how it is encoded within a packet to enable this
> functionality."
>  is not clear enough?
> =20
> =20
> - I think abbreviations such as "aka" shall be avoided
> =20
> Absolutely, thanks. An instance of "aka" and "one" of i.e. have been =
replaced.
> =20
> =20
> - The expression " to achieve their goal" shall be put in context.
> Which is the goal? Maybe it is easier to write "Network-enabled
> applications in the industrial context must provide..."
> =20
> No problem. What do you think about this rephrase:
> "Network-enabled applications in the industrial context must provide =
stringent guarantees in terms of reliability and predictability. To =
achieve this they typically leverage 1+1 redundancy, also known as =
Packet Replication and Elimination (PRE) =
[I-D.papadopoulos-6tisch-pre-reqs =
<https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I-D.papa=
dopoulos-6tisch-pre-reqs>].
> =20
> =20
> - The phrase "In order
>    for wireless networks to be able to be used in such applications, =
the
>    principles of Deterministic Networking =
[I-D.ietf-detnet-architecture =
<https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I-D.ietf=
-detnet-architecture>]
>    lead to designs that aim at maximizing packet delivery rate and
>    minimizing latency and jitter."
> should be rewritten differently, it is a little bit complex and long.
> =46rom that expression, I understand that if you are aiming to apply =
detnet principles to LLNs, the design shall comply with these =
principles. Am I right?
> =20
> Yes, you are correct. This is the idea.
> What do you think about this rephrase:
> "Allowing these kinds of applications to function over wireless =
networks requires the application of the principles of Deterministic =
Networking [I-D.ietf-detnet-architecture =
<https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I-D.ietf=
-detnet-architecture>].This results in designs which aim at maximizing =
packet delivery rate and minimizing latency and jitter."
> =20
> =20
> - "uses a fixed communication schedule" is it fixed? I think it could =
be better to explain that by using timeslots, TSCH looks like TDMA in =
the time dimension (and only for better understanding).
> =20
> Well, actually the schedule is not completely fixed, at least not =
permanently.
> The point is that with TSCH you can avoid probabilistic medium access =
by having a common agreed-upon schedule.
> =20
> Maybe this rephrase is better?
> "As an example, to meet this goal, IEEE Std. 802.15.4 [IEEE802154-2015 =
<https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-IEEE8021=
54-2015>] provides
> Time-Slotted Channel Hopping (TSCH), a mode of operation which uses a =
common communication schedule
> based on timeslots to allow deterministic medium access as well as =
..."
> =20
> -  " isn't it "to provide"? and "and limit jitter" should be "to =
limit"?
> =20
> Thanks, fixed.
> =20
> - "achieves a controlled redundancy" to "achieves controlled =
redundancy"
> =20
> Yes, thanks, fixed.
> =20
> - "within the remit of" I do not understand the expression.
> =20
> Means within the area of responsibility of. Rephrased as:
> "which is among the responsibilities of the RPL Objective Function"
> =20
> - "The specification of the transmission of this information is the =
focus of this document."
> could it be "This document focuses on the specification of the =
transmission of this specific path information"
> =20
> Sure, thanks. Rephrased as suggested.
> =20
> - "More concretely" to "Specifically"
> =20
> It is followed by "this specification focuses ..".
> It would become: "Specifically, this specification focuses .."
> Left as is, unless a bigger rephrase is required.
> =20
> - "children nodes of the node" of the parent node? maybe "children of =
the parent node"?
> =20
> Yes, better, rephrased as "children of the node".
> =20
> - "This specification defines the type value and structure for this =
TLV" to "This specification defines the type value and structure for the =
parent address set TLV". Is there an abbreviation of the parent address =
set (such as PAS)?
> =20
> No problem, replaced as suggested. The abbreviation is PS (Parent =
Set).
> =20
> - "The sending of multiple" to "The transmission of multiple" is =
better here.
> =20
> No problem. Replaced as suggested.=20
> =20
> - "The sending of multiple copies of a packet using multi-path =
forwarding over a multi-hop network and the consolidation of multiple =
received packet copies to control flooding."
> looks awkward. The verb is missing.
> =20
> Well, the defined term is a noun so for me it makes sense that there =
is no verb. I would agree that it is a bit complex, however. Rephrased =
to:
> "A method which transmits multiple copies of a packet using multi-path =
forwarding over a multi-hop network and which consolidates multiple =
received packet copies
> to control flooding. See "Exploiting Packet Replication and =
Elimination in Complex Tracks in 6TiSCH LLNs"
> [I-D.papadopoulos-6tisch-pre-reqs =
<https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I-D.papa=
dopoulos-6tisch-pre-reqs>] for more details."
> =20
> - " [I-D.papadopoulos-6tisch-pre-reqs =
<https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I-D.papa=
dopoulos-6tisch-pre-reqs>] for more." to " =
[I-D.papadopoulos-6tisch-pre-reqs =
<https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I-D.papa=
dopoulos-6tisch-pre-reqs>] for more details.
> =20
> No problem. Fixed.
> =20
> - "The problem of how to select the next hop target node for a packet =
copy to be forwarded to when performing packet replication." can be =
rephrased: "Defines the mechanism to choose the next hop node to forward =
a packet copy when replicating" (although I think still needs some work =
on it)
> =20
> Thanks. As a first step rephrased to:=20
> "The mechanism for choosing the next hop node to forward a packet copy =
when replicating packets."
> =20
> - "Preferred Parent (PP)" is defined after PP is used for the first =
time.
> =20
> Good catch, thanks. Fixed.
> =20
> - "AP node, functionality which is included in the operation of the =
RPL Objective=20
>    Function (OF)." to "AP node. This functionality which is included =
in the operation of the RPL Objective Function (OF)." =20
> =20
> No problem, replaced as suggested.
> =20
> - "A scheme which allows the two paths to remain
>    correlated is detailed here.  More specifically, in this scheme a
>    node will select an AP node close to its PP node to allow the
>    operation of overhearing between parents.  If multiple potential =
APs
>    match this condition, the AP with the lowest rank will be =
registered".
> I think this expression can be improved eliminating the first part.
> "The node will select an AP node close to its PP node to allow the =
operation of overhearing between parents. If multiple potential APs =
match this condition, the AP with the lowest rank will be registered".
> =20
> Thank you for the comment. In this instance I would prefer that
> "A scheme which allows the two paths to remain correlated is detailed =
here."
> is kept, because at this point the draft only gives an *example* of a =
potential scheme for alternative parent selection, with the specific =
feature that the two paths remain correlated. There are other options =
available and this draft at this point does not propose any choice.
> I would like to keep it clear that this scheme is not part of the spec =
itself.
> I am of course open for discussion.
> =20
> - I have not seen anything about overhearing before this point. I =
think overhearing can be either explained shortly or referenced to =
another document.=20
> =20
> Very good point. This is actually the only mention of overhearing, =
since although it is beneficial to performance and we do use it in our =
implementation, it is in no way required for this spec. Overhearing is =
only mentioned here because keeping the paths correlated increased the =
chances of taking advantage of overhearing.
> I have referenced a section in papadopoulos-6tisch-pre-reqs which =
explains it a bit more for those interested.
> =20
> - In general, from the abstract and the title, I was expecting only =
the technical description of the extension, without the AP selection =
mechanism. =46rom my point of view, either the mechanism should be =
described in another document and referenced in this one, or the goal of =
the document shall be expanded to include the mechanism too.
> =20
> I agree that this is an issue. As I have answered to your first =
comment in more detail, for now the answer has been that this draft only =
specifies the parent set information, not the Objective Function.
> We can definitely discuss this though.
> =20
> -  Moreover, the description of the NSA extension can be expanded to =
be used for other selection mechanisms which may consider different =
criteria to take advantage of  alternative parent selection.=20
> =20
> Sure, any ideas are very welcome. :)
> =20
> =20
> As always, open to any comments on the above.
> Regards,
> =20
>                                 Diego=20
> =20
> Again, thank you very much for the help..
> A new version of the draft (draft-ietf-roll-nsa-extension-03) has been =
posted with the discussed changes.
> =20
> Best,
> Aris
>=20
> =20
> =20
> =20
> --=20
> DIEGO DUJOVNE
> Profesor Asociado
> Escuela de Inform=C3=A1tica y Telecomunicaciones
> Facultad de Ingenier=C3=ADa - Universidad Diego Portales - Chile
> www.ingenieria.udp.cl <http://www.ingenieria.udp.cl/>
> (56 2) 676 8125
> _______________________________________________
> Roll mailing list
> Roll@ietf.org <mailto:Roll@ietf.org>
> https://www.ietf.org/mailman/listinfo/roll =
<https://www.ietf.org/mailman/listinfo/roll>

--Apple-Mail=_B1E8CF1C-7BD0-4C56-9D04-9EFB1C72A463
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hello Pascal,<div class=3D""><br class=3D""></div><div =
class=3D"">Noted, we will updated it accordingly.</div><div class=3D""><br=
 class=3D""></div><div class=3D"">many thanks,</div><div =
class=3D"">Giorgos</div><div class=3D""><br class=3D""><div class=3D"">
</div>
<br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jul 1, 2019, at 15:57, Pascal Thubert (pthubert) &lt;<a =
href=3D"mailto:pthubert@cisco.com" class=3D"">pthubert@cisco.com</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;"><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">Hello Remous<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-family: 'Courier New';" class=3D"">maximizing packet =
delivery rate and minimizing latency and jitter."</span><o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">The goal =
is to optimize packet delivery within bounded latency. For some flows =
the controller can also minimize the latecy but only a few. Think of an =
ambulance with all the green lights as it traverses the city. Other =
important vehicles e.g., police, will have to wait more. Minimizing =
jitter can be a secondary goal, not always.<o:p =
class=3D""></o:p></div><div style=3D"border-style: none none solid; =
border-bottom-color: windowtext; border-bottom-width: 1pt; padding: 0cm =
0cm 1pt;" class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; border: none; padding: 0cm;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">"As an example, to meet this goal, IEEE Std. 802.15.4 [<a =
href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I=
EEE802154-2015" target=3D"_blank" title=3D"&quot;IEEE Std 802.15.4-2015 =
Standard for Low-Rate Wireless Personal Area Networks (WPANs)&quot;" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">IEEE802154-2015</a>] provides<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Please use dateless reference unless =
you want to quote a particular text or section that may move or go away =
in the next respin.<o:p class=3D""></o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">e.g.,<o:p class=3D""></o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;reference =
anchor=3D"IEEE802154"&gt;<o:p class=3D""></o:p></div><div style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;front&gt;<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; &lt;title&gt;IEEE Std. 802.15.4, Part. 15.4: Wireless Medium =
Access<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; Control (MAC) and Physical Layer (PHY) Specifications for =
Low-Rate<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; Wireless Personal Area Networks<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; &lt;/title&gt;<o:p class=3D""></o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; &lt;author&gt;<o:p class=3D""></o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; &lt;organization&gt;IEEE standard for Information =
Technology&lt;/organization&gt;<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; &lt;/author&gt;<o:p class=3D""></o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; &lt;date/&gt;<o:p class=3D""></o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;/front&gt;<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/reference&gt;<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">All the =
best,<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Pascal<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"border-style: none none none =
solid; border-left-color: blue; border-left-width: 1.5pt; padding: 0cm =
0cm 0cm 4pt;" class=3D""><div class=3D""><div style=3D"border-style: =
solid none none; border-top-color: rgb(225, 225, 225); border-top-width: =
1pt; padding: 3pt 0cm 0cm;" class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><b class=3D"">From:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Roll &lt;<a =
href=3D"mailto:roll-bounces@ietf.org" =
class=3D"">roll-bounces@ietf.org</a>&gt;<span =
class=3D"Apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>Remous-Aris =
Koutsiamanis<br class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>vendredi 28 juin 2019 =
17:45<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Routing Over Low power and =
Lossy networks &lt;<a href=3D"mailto:roll@ietf.org" =
class=3D"">roll@ietf.org</a>&gt;<br class=3D""><b class=3D"">Cc:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Georgios Z. Papadopoulos =
&lt;<a href=3D"mailto:georgios.papadopoulos@imt-atlantique.fr" =
class=3D"">georgios.papadopoulos@imt-atlantique.fr</a>&gt;<br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: [Roll] Review of =
draft-ietf-roll-nsa-extension-02<o:p =
class=3D""></o:p></div></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Hello =
Diego,<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">thank you very much for reviewing the draft and for providing =
us with your feedback.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">The issue of scope also =
might concern Rahul as well, so I have CCed him as well.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Responses follow inline.<o:p =
class=3D""></o:p></div></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">On Wed, Jun 26, 2019 at =
1:56 AM Prof. Diego Dujovne &lt;<a =
href=3D"mailto:diego.dujovne@mail.udp.cl" style=3D"color: purple; =
text-decoration: underline;" class=3D"">diego.dujovne@mail.udp.cl</a>&gt; =
wrote:<o:p class=3D""></o:p></div></div><blockquote style=3D"border-style:=
 none none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Dear all,<o:p class=3D""></o:p></div><div=
 class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; My review of the draft below:<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">- The abstract should include more =
details about the purpose<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">of packet replication and =
the context where the metric will<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">be used. Is it an =
Objective Function? Is it a new mechanism?<o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">As you guessed and as you said in =
another of your comments further below, the scope of this draft may need =
some clarification. Up to this point, the from feedback that we have =
received and from discussions with others, we took the path of providing =
some introductory material as well as examples of potential uses of the =
Parent Set information in an Objective Function.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">However, and this is the main point, the draft only specifies =
the information to be transferred, its encoding, compression, etc. How =
exactly it is to be used (Objective Function) is outside the =
specification. The options are to:<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">a) Create another document =
with the operation of an OF which uses this<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">b) Extend this draft with the spec of an OF that uses the =
information.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Since there is already work by Rahul which might take =
advantage of the same information in a different way, we chose a).<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Rahul, any comments?<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">In any case, do you think that<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">"<span style=3D"font-size: 10pt; font-family: 'Courier New';" =
class=3D"">This document details what information needs to be</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10pt; font-family: 'Courier New';" =
class=3D"">transmitted and how it is encoded within a packet to enable =
this</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span style=3D"font-size: 10pt; =
font-family: 'Courier New';" class=3D"">functionality."</span><o:p =
class=3D""></o:p></div></div><div class=3D""><pre style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';" =
class=3D""><span style=3D"font-family: Arial, sans-serif;" class=3D""> =
is not clear enough?</span><o:p class=3D""></o:p></pre></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><blockquote style=3D"border-style: =
none none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">- I think abbreviations such as "aka" shall be avoided<o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Absolutely, thanks. An instance of =
"aka" and "one" of i.e. have been replaced.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">- The expression "<span style=3D"font-size: 10pt;" =
class=3D""><span class=3D"Apple-converted-space">&nbsp;</span>to achieve =
their goal" shall be put in context.</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10pt;" class=3D"">Which is the =
goal? Maybe it is easier to write "Network-enabled</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10pt;" class=3D"">applications in =
the industrial context must provide..."</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">No problem. What do you think about =
this rephrase:<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span style=3D"font-family: 'Courier =
New';" class=3D"">"</span><span style=3D"font-size: 10pt; font-family: =
'Courier New';" class=3D"">Network-enabled applications in the =
industrial context must provide</span><span style=3D"font-family: =
'Courier New';" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span></span><span =
style=3D"font-family: 'Courier New';" class=3D"">stringent guarantees in =
terms of reliability and predictability. To achieve this they typically =
leverage 1+1 redundancy, also known as Packet Replication and =
Elimination (PRE) [<a =
href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I=
-D.papadopoulos-6tisch-pre-reqs" target=3D"_blank" =
title=3D"&quot;Exploiting Packet Replication and Elimination in Complex =
Tracks in 6TiSCH LLNs&quot;" style=3D"color: purple; text-decoration: =
underline;" class=3D"">I-D.papadopoulos-6tisch-pre-reqs</a>].</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">- The phrase "<span =
style=3D"font-size: 10pt;" class=3D"">In order</span><o:p =
class=3D""></o:p></div><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><span style=3D"" =
class=3D"">&nbsp;&nbsp; for wireless networks to be able to be used in =
such applications, the<o:p class=3D""></o:p></span></pre><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><span style=3D"" class=3D"">&nbsp;&nbsp; =
principles of Deterministic Networking [<a =
href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I=
-D.ietf-detnet-architecture" target=3D"_blank" =
title=3D"&quot;Deterministic Networking Architecture&quot;" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">I-D.ietf-detnet-architecture</a>]<o:p =
class=3D""></o:p></span></pre><pre style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 10pt; font-family: 'Courier New';" class=3D""><span style=3D"" =
class=3D"">&nbsp;&nbsp; lead to designs that aim at maximizing packet =
delivery rate and<o:p class=3D""></o:p></span></pre><pre style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';" =
class=3D""><span style=3D"" class=3D"">&nbsp;&nbsp; minimizing latency =
and jitter."<o:p class=3D""></o:p></span></pre><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">should be rewritten differently, it is a little bit complex =
and long.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">=46rom that expression, I understand =
that if you are aiming to apply detnet principles to LLNs, the design =
shall comply with these principles. Am I right?<o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Yes, you are correct. This is the =
idea.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">What do you think about this =
rephrase:<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span style=3D"font-family: 'Courier =
New';" class=3D"">"Allowing these kinds of applications to function over =
wireless networks requires the application of the principles of =
Deterministic Networking [<a =
href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I=
-D.ietf-detnet-architecture" target=3D"_blank" =
title=3D"&quot;Deterministic Networking Architecture&quot;" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">I-D.ietf-detnet-architecture</a>].This results in designs =
which aim at maximizing packet delivery rate and minimizing latency and =
jitter."</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">- "<span style=3D"font-size: 10pt;" class=3D"">uses a fixed =
communication schedule" is it fixed? I think it could be better to =
explain that by using timeslots, TSCH looks like TDMA in the time =
dimension (and only for better understanding).</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Well, actually the schedule is not =
completely fixed, at least not permanently.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">The point is that with TSCH you can avoid probabilistic =
medium access by having a common agreed-upon schedule.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Maybe this rephrase is better?<o:p =
class=3D""></o:p></div></div><div class=3D""><pre style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 10pt; font-family: 'Courier New';" class=3D"">"As=
 an example, to meet this goal, IEEE Std. 802.15.4 [<a =
href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I=
EEE802154-2015" target=3D"_blank" title=3D"&quot;IEEE Std 802.15.4-2015 =
Standard for Low-Rate Wireless Personal Area Networks (WPANs)&quot;" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">IEEE802154-2015</a>] provides<br class=3D"">Time-Slotted =
Channel Hopping (TSCH), a mode of operation which uses a common =
communication schedule<br class=3D"">based on timeslots to allow =
deterministic medium access as well as ..."<o:p =
class=3D""></o:p></pre></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-family: Arial, sans-serif;" =
class=3D"">&nbsp;</span><o:p class=3D""></o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">-&nbsp; =
"<span style=3D"font-size: 10pt;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>isn't it "to provide"? and =
"and limit jitter" should be "to limit"?</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Thanks, fixed.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">- "achieves a controlled =
redundancy" to "achieves controlled redundancy"</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Yes, thanks, fixed.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">- "within the remit of" I do not =
understand the expression.</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Means within the area of responsibility =
of. Rephrased as:<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><span style=3D"font-family: 'Courier =
New';" class=3D"">"which is among the responsibilities of the RPL =
Objective Function"</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
10pt;" class=3D"">- "The specification of&nbsp;the transmission of this =
information is the focus of this document."</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10pt;" class=3D"">could it be "This =
document focuses on the specification of the transmission of this =
specific path information"</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Sure, thanks. Rephrased as =
suggested.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
10pt;" class=3D"">- "More concretely" to "Specifically"</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">It is followed by "<span =
style=3D"font-family: 'Courier New';" class=3D"">this specification =
focuses ..</span>".<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">It would become:<span =
style=3D"font-family: 'Courier New';" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>"Specifically, this =
specification focuses .."</span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-family: =
Arial, sans-serif;" class=3D"">Left as is, unless a bigger rephrase is =
required.</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
10pt;" class=3D"">- "children nodes of the node" of the parent =
node?&nbsp;maybe "children of the parent node"?</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Yes, better, rephrased as "<span =
class=3D"gmail-im"><span style=3D"font-size: 10pt; font-family: 'Courier =
New';" class=3D"">children of the node</span></span><span =
class=3D"gmail-im"><span style=3D"font-size: 10pt;" =
class=3D"">".</span></span><o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
10pt;" class=3D"">- "This specification defines the type value and =
structure for&nbsp;this TLV" to "This specification defines the type =
value and structure for the parent address set&nbsp;TLV". Is there an =
abbreviation of the parent address set (such as PAS)?</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">No problem, replaced as suggested. The =
abbreviation is PS (Parent Set).<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
10pt;" class=3D"">- "The sending of multiple" to "The transmission of =
multiple" is better here.</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">No problem. Replaced as suggested.<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">- "The sending of =
multiple&nbsp;copies of a packet using multi-path forwarding over a =
multi-hop&nbsp;network and the consolidation of multiple received packet =
copies&nbsp;to control flooding."</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10pt;" class=3D"">looks awkward. =
The verb is missing.</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Well, the defined term is a noun so for =
me it makes sense that there is no verb. I would agree that it is a bit =
complex, however. Rephrased to:<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-family: =
'Courier New';" class=3D"">"A method which transmits multiple copies of =
a packet using multi-path forwarding over a multi-hop network and which =
consolidates multiple received packet copies</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-family: 'Courier New';" class=3D"">to =
control flooding. See "Exploiting Packet Replication and Elimination in =
Complex Tracks in 6TiSCH LLNs"</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-family: 'Courier New';" class=3D"">[<a =
href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I=
-D.papadopoulos-6tisch-pre-reqs" target=3D"_blank" =
title=3D"&quot;Exploiting Packet Replication and Elimination in Complex =
Tracks in 6TiSCH LLNs&quot;" style=3D"color: purple; text-decoration: =
underline;" class=3D"">I-D.papadopoulos-6tisch-pre-reqs</a>] for more =
details."</span><o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
10pt;" class=3D"">- " [</span><a =
href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I=
-D.papadopoulos-6tisch-pre-reqs" target=3D"_blank" =
title=3D"&quot;Exploiting Packet Replication and Elimination in Complex =
Tracks in 6TiSCH LLNs&quot;" style=3D"color: purple; text-decoration: =
underline;" class=3D""><span style=3D"font-size: 10pt;" =
class=3D"">I-D.papadopoulos-6tisch-pre-reqs</span></a>] for more." to =
"<span style=3D"font-size: 10pt;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>[</span><a =
href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-02#ref-I=
-D.papadopoulos-6tisch-pre-reqs" target=3D"_blank" =
title=3D"&quot;Exploiting Packet Replication and Elimination in Complex =
Tracks in 6TiSCH LLNs&quot;" style=3D"color: purple; text-decoration: =
underline;" class=3D""><span style=3D"font-size: 10pt;" =
class=3D"">I-D.papadopoulos-6tisch-pre-reqs</span></a><span style=3D"" =
class=3D"">] for more details.</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">No problem. Fixed.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">- "The problem of how to select =
the&nbsp;next hop target node for a packet copy to be forwarded to =
when&nbsp;performing packet replication." can be rephrased: "Defines the =
mechanism to choose the next hop node to forward a packet copy when =
replicating" (although I think still needs some work on it)</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Thanks. As a first step rephrased =
to:<span class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-family: 'Courier New';" =
class=3D"">"</span><span style=3D"font-size: 10pt; font-family: 'Courier =
New';" class=3D"">The mechanism for choosing the next hop node to =
forward a packet copy when replicating packets."</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">- "Preferred Parent (PP)" is =
defined after PP is used for the first time.</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Good catch, thanks. Fixed.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">- "AP node,&nbsp;functionality =
which is included in the operation of the RPL Objective&nbsp;</span><o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10pt;" class=3D"">&nbsp; =
&nbsp;Function (OF)." to&nbsp;"AP node. This&nbsp;functionality which is =
included in the operation of the RPL Objective&nbsp;Function =
(OF)."&nbsp;&nbsp;</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></blockquote><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">No problem, replaced as suggested.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">- "A scheme which allows the two =
paths to remain</span><o:p class=3D""></o:p></div></div><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><span style=3D"" class=3D"">&nbsp;&nbsp; =
correlated is detailed here.&nbsp; More specifically, in this scheme =
a<o:p class=3D""></o:p></span></pre><pre style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 10pt; font-family: 'Courier New';" class=3D""><span =
style=3D"" class=3D"">&nbsp;&nbsp; node will select an AP node close to =
its PP node to allow the<o:p class=3D""></o:p></span></pre><pre =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 10pt; font-family: =
'Courier New';" class=3D""><span style=3D"" class=3D"">&nbsp;&nbsp; =
operation of overhearing between parents.&nbsp; If multiple potential =
APs<o:p class=3D""></o:p></span></pre><pre style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 10pt; font-family: 'Courier New';" class=3D""><span =
style=3D"" class=3D"">&nbsp;&nbsp; match this condition, the AP with the =
lowest rank will be registered".<o:p class=3D""></o:p></span></pre><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">I think this expression =
can be improved eliminating the first part.<o:p =
class=3D""></o:p></div></div><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"" =
class=3D"">"The&nbsp;</span><span style=3D"font-size: 10pt;" =
class=3D"">node will select an AP node close to its PP node to allow =
the&nbsp;operation of overhearing between parents. If multiple potential =
APs&nbsp;match this condition, the AP with the lowest rank will be =
registered".</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Thank you for the comment. In this instance I would prefer =
that<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">"A scheme which allows the two paths to =
remain correlated is detailed here."<o:p class=3D""></o:p></div></div><div=
 class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">is kept, because at this =
point the draft only gives an<span =
class=3D"Apple-converted-space">&nbsp;</span><i =
class=3D"">*example*</i><span =
class=3D"Apple-converted-space">&nbsp;</span>of a potential scheme for =
alternative parent selection, with the specific feature that the two =
paths remain correlated. There are other options available and this =
draft at this point does not propose any choice.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">I would like to keep it clear that this scheme is not part of =
the spec itself.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">I am of course open for discussion.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10pt;" class=3D"">- I have not seen =
anything about overhearing before this point. I think overhearing can be =
either explained shortly or referenced to another =
document.&nbsp;</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Very good point. This is actually the only mention of =
overhearing, since although it is beneficial to performance and we do =
use it in our implementation, it is in no way required for this spec. =
Overhearing is only mentioned here because keeping the paths correlated =
increased the chances of taking advantage of overhearing.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">I have referenced a section =
in&nbsp;papadopoulos-6tisch-pre-reqs which explains it a bit more for =
those interested.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">- In general, from the abstract =
and the title, I was expecting only the technical description of the =
extension, without the AP selection mechanism. =46rom my point of view, =
either the mechanism should be described in another document and =
referenced in this one, or the goal of the document shall be expanded to =
include the mechanism too.</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">I agree that this is an issue. As I have answered to your =
first comment in more detail, for now the answer has been that this =
draft only specifies the parent set information, not the Objective =
Function.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">We can definitely discuss this =
though.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><blockquote style=3D"border-style: =
none none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><span =
style=3D"font-size: 10pt;" class=3D"">-&nbsp; Moreover, the description =
of the NSA extension can be expanded to be used for other selection =
mechanisms which may consider different criteria to take advantage =
of&nbsp; alternative parent selection.&nbsp;</span><o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Sure, any ideas are very welcome. :)<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;<o:p class=3D""></o:p></div></div><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt =
0cm 5pt 4.8pt;" class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">As always, open to any comments on the =
above.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Regards,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; Diego&nbsp;<o:p =
class=3D""></o:p></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div></div></div></div></div></div></div=
></div></div></div></div></blockquote><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Again, thank you very much for the help..<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">A new version of the draft (<span =
class=3D"gmail-filename">draft-ietf-roll-nsa-extension-03)<span =
class=3D"Apple-converted-space">&nbsp;</span></span>has been posted with =
the discussed changes.<o:p class=3D""></o:p></div></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Best,<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
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CC: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] Review of draft-ietf-roll-nsa-extension-02
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From: <dominique.barthel@orange.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>, "aris@ariskou.com" <aris@ariskou.com>, Pascal Thubert <pthubert@cisco.com>, "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>
Thread-Topic: [Roll] I-D Action: draft-ietf-roll-nsa-extension-02.txt
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Date: Mon, 1 Jul 2019 15:26:23 +0000
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To: "dominique.barthel@orange.com" <dominique.barthel@orange.com>, "Routing Over Low power and Lossy networks" <roll@ietf.org>, "aris@ariskou.com" <aris@ariskou.com>, "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>
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From: "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>
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Date: Mon, 1 Jul 2019 17:51:40 +0200
Cc: "dominique.barthel@orange.com" <dominique.barthel@orange.com>, Routing Over Low power and Lossy networks <roll@ietf.org>, Aris <aris@ariskou.com>
Message-Id: <19B2FF84-F99B-40BF-81BF-8788D3478B1C@imt-atlantique.fr>
References: <156139562335.17453.10181644975970552720@ietfa.amsl.com> <CAK76Pr=cOTdAfnxyC9Bq2BPqEzwsH=2LvbZsGuSJjuV6uyvqrQ@mail.gmail.com> <20818_1561994784_5D1A2620_20818_214_5_D93FEF87.62BE1%dominique.barthel@orange.com> <MN2PR11MB35659CC596E5F23ED47CFC9AD8F90@MN2PR11MB3565.namprd11.prod.outlook.com>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/6Mue53u0bU-a0-hrtcxnwbIgIGM>
Subject: Re: [Roll] I-D Action: draft-ietf-roll-nsa-extension-02.txt
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Hello Pascal,

Below is the summarized discussion.

Basically, is it good idea to use capitalized "SHOULD=E2=80=9D" or lower =
case =E2=80=9Cshould=E2=80=9D when talking about compressing the parent =
address list.
In the draft we suggest using a implementation similar to SRH-6LoRH for =
the IPv6 address (which we have implemented in Contiki btw).
However, its similar but not identical to the one in SRH-6LoRH.
Dominique says, if we use capitalized =E2=80=9CSHOULD=E2=80=9D then it =
might create problems in the WGLC, if we do not have have an explicit =
spec.
Thus, in the -3 version we have used lower case "should=E2=80=9D.

What do you think?
Georgios and Aris

=E2=80=94 =E2=80=94 =E2=80=94=20

Happy to contribute : )
=20
Can someone summarize the discussion?
=20
All the best,
=20
Pascal


> On Jul 1, 2019, at 17:44, Pascal Thubert (pthubert) =
<pthubert@cisco.com> wrote:
>=20
> Section 4.2: "Therefore, the PS IPv6 address(es) field SHOULD be =
compressed using the compression method for Source Routing Header 6LoRH =
(SRH-6LoRH)". I understand that a similar compression mechanism could be =
used. However, this requires defining a protocol element that does not =
exist today, unless I missed something. Therefore, the normative SHOULD =
is irrelevant. I guess this section is merely suggesting future work.=20
> We do have this almost fully implemented (almost: only works in single =
root RPL instances).
> Would it make sense to spell out the exact specification of the =
compression even if it is largely a copy of the SRH-6LoRH compression =
method?
> I can lowercase the SHOULD, but using this kind of compression really =
makes big difference in practice.

> [DB] talk to Pascal about this, he looks pretty knowledgeable in =
SHOULDs. Anyway, if you capitalise SHOULD, then you have to explain the =
consequences of not following the recommendation. Whereas if you =
lowercase it, it's only free advice. You can stil explain why you think =
it is a good idea. My worry is that a capitalised SHOULD here will stop =
the draft later in the IESG processing because you are referring to a =
non-existent specification (formally speaking). Again, ask Pascal, I =
totally trust him on this question.


--Apple-Mail=_46BE243C-9A83-4390-8811-5A5E8A052288
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Hello =
Pascal,</div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><br class=3D""></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Below is the summarized =
discussion.</div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D""><br =
class=3D""></div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">Basically, is it =
good idea to use capitalized "SHOULD=E2=80=9D" or lower case =
=E2=80=9Cshould=E2=80=9D when talking about compressing the parent =
address list.</div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">In the draft we =
suggest using a implementation similar to SRH-6LoRH for the IPv6 address =
(which we have implemented in Contiki btw).</div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">However, its similar but not identical to the one in =
SRH-6LoRH.</div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">Dominique says, if we use =
capitalized =E2=80=9CSHOULD=E2=80=9D then it might create problems in =
the WGLC, if we do not have have an explicit spec.</div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Thus, in the -3 version we have used =
lower case "should=E2=80=9D.</div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><br class=3D""></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">What do =
you think?</div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">Georgios and =
Aris</div><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><br class=3D""></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">=E2=80=94 =E2=80=94 =E2=80=94&nbsp;</div>=
<div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><br class=3D""></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">Happy to contribute : )<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">Can =
someone summarize the discussion?<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">All the best,<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Pascal</div></div></div><div class=3D""><br =
class=3D""></div><br class=3D""><div><blockquote type=3D"cite" =
class=3D""><div class=3D"">On Jul 1, 2019, at 17:44, Pascal Thubert =
(pthubert) &lt;<a href=3D"mailto:pthubert@cisco.com" =
class=3D"">pthubert@cisco.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><div class=3D""><div =
class=3D""><div class=3D""><div class=3D""><blockquote =
style=3D"border-style: none none none solid; border-left-color: rgb(204, =
204, 204); border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; =
margin-left: 4.8pt; margin-right: 0cm;" class=3D""><div class=3D""><div =
class=3D""><ul type=3D"disc" style=3D"margin-bottom: 0cm;" class=3D""><li =
class=3D"MsoNormal" style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;"><span style=3D"font-size: 10.5pt;" =
class=3D"">Section 4.2: "Therefore, the PS&nbsp;IPv6 address(es) field =
SHOULD be compressed using the compression&nbsp;method for Source =
Routing Header 6LoRH (SRH-6LoRH)".&nbsp;I understand that a similar =
compression mechanism could be used. However, this requires defining a =
protocol element that does not exist today, unless&nbsp;I missed =
something. Therefore, the normative SHOULD is irrelevant.&nbsp;I guess =
this section is merely suggesting future work.&nbsp;<o:p =
class=3D""></o:p></span></li></ul></div></div></blockquote><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
10.5pt;" class=3D"">We do have this almost fully implemented (almost: =
only works in single root RPL instances).<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10.5pt;" class=3D"">Would it make =
sense to spell out the exact specification of the compression even if it =
is largely a copy of the SRH-6LoRH compression method?<o:p =
class=3D""></o:p></span></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10.5pt;" class=3D"">I can lowercase =
the SHOULD, but using this kind of compression really makes big =
difference in =
practice.</span></div></div></div></div></div></div></div></div></blockquo=
te><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; orphans: auto; text-align: start; text-indent: =
0px; text-transform: none; white-space: normal; widows: auto; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><div =
class=3D""><div class=3D""><div class=3D""><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span style=3D"font-size: =
10.5pt;" class=3D""><o:p =
class=3D""></o:p></span></div></div></div></div></div></div></div><div =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span style=3D"font-size: 10.5pt;" class=3D"">[DB] talk to =
Pascal about this, he looks pretty knowledgeable in SHOULDs. Anyway, if =
you capitalise SHOULD, then you have to explain the consequences of not =
following the recommendation. Whereas if you lowercase it, it's only =
free advice. You can stil explain why you think it is a good idea. My =
worry is that a capitalised SHOULD here will stop the draft later in the =
IESG processing because you are referring to a non-existent =
specification (formally speaking). Again, ask Pascal, I totally trust =
him on this question.</span></div></div></div></blockquote></div><br =
class=3D""></body></html>=

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From: <dominique.barthel@orange.com>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>, "aris@ariskou.com" <aris@ariskou.com>, "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>
Thread-Topic: [Roll] I-D Action: draft-ietf-roll-nsa-extension-02.txt
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Date: Mon, 1 Jul 2019 15:52:46 +0000
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References: <156139562335.17453.10181644975970552720@ietfa.amsl.com> <CAK76Pr=cOTdAfnxyC9Bq2BPqEzwsH=2LvbZsGuSJjuV6uyvqrQ@mail.gmail.com> <20818_1561994784_5D1A2620_20818_214_5_D93FEF87.62BE1%dominique.barthel@orange.com> <MN2PR11MB35659CC596E5F23ED47CFC9AD8F90@MN2PR11MB3565.namprd11.prod.outlook.com>
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "dominique.barthel@orange.com" <dominique.barthel@orange.com>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>, "aris@ariskou.com" <aris@ariskou.com>, "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>
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Subject: Re: [Roll] I-D Action: draft-ietf-roll-nsa-extension-02.txt
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: [Roll] 6LoRH type in useofRPLinfo
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Dear all

Reviewing again https://tools.ietf.org/html/draft-ietf-roll-useofrplinfo-25=
 I think we made a mistake in Fig 3:

The format of RFC 8138 compressed packet is presented as:

   +--+-----+---+--------------+-----------+-----------+-----------+
   |1 | 0|0 |TSE| 6LoRH Type 6 | Hop Limit | RPI-6LoRH |LOWPAN IPHC|
   +--+-----+---+--------------+-----------+-----------+-----------+

But it should really be as fig 20 in RFC 8138, meaning the RPI is before th=
e IP-in-IP:




+-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...

 |11110001|SRH-6LoRH| RPI-  | IP-in-IP | NH=3D1      |11110CPP| UDP | UDP

 |Page 1  |Type1 S=3D2| 6LoRH |  6LoRH   |LOWPAN_IPHC| UDP    | hdr |Payld

 +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-...

            <-8bytes->                  <-        RFC 6282<https://tools.ie=
tf.org/html/rfc6282>      ->

                                                No RPL artifact



               Figure 20: Example Compressed Packet with SRH

Data is removed from the left as consumed. Removing the IP-in-IP removes ev=
erything left of it including RPI.
What gets forwarded to the unaware leaf starts at the LOWPAN_IPHC.
What's worth noting is that in Storing Mode the SRH contains the address of=
 the 6LR that decapsulates.
IOW the SRH encodes the destination of IP-in-IP, whereas the root is the so=
urce so the encapsulator in the IP-in-IP 6LoRH is elided...

All the best,

Pascal




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<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Reviewing again https://tools.ietf.org/html/draft-ie=
tf-roll-useofrplinfo-25 I think we made a mistake in Fig 3:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The format of RFC 8138 compressed packet is presente=
d as:<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; &#43;--&#43;-----&#43;---&#43;--------------&=
#43;-----------&#43;-----------&#43;-----------&#43;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; |1 | 0|0 |TSE| 6LoRH Type 6 | Hop Limit | RPI=
-6LoRH |LOWPAN IPHC|<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; &#43;--&#43;-----&#43;---&#43;--------------&=
#43;-----------&#43;-----------&#43;-----------&#43;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">But it should really be as fig 20 in RFC 8138, meani=
ng the RPI is before the IP-in-IP:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&#43;-&#43; ... -&#43;-&#43; ... &#43;-&#43;- ... -&#43;-&#43;- ... &#=
43;-&#43;-&#43;-&#43; ... &#43;-&#43;-&#43; ... -&#43; ... &#43;-...<o:p></=
o:p></pre>
<pre> |11110001|SRH-6LoRH| RPI-&nbsp; | IP-in-IP | NH=3D1&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; |11110CPP| UDP | UDP<o:p></o:p></pre>
<pre> |Page 1&nbsp; |Type1 S=3D2| 6LoRH |&nbsp; 6LoRH&nbsp;&nbsp; |LOWPAN_I=
PHC| UDP&nbsp;&nbsp;&nbsp; | hdr |Payld<o:p></o:p></pre>
<pre> &#43;-&#43; ... -&#43;-&#43; ... &#43;-&#43;- ... -&#43;-&#43;-- ... =
-&#43;-&#43;-&#43; ... &#43;-&#43;-&#43; ... -&#43; ... &#43;-...<o:p></o:p=
></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt=
;-8bytes-&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; <a href=3D"https://tools.ietf.org/html/rfc6282">RFC 6282</a>&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -&gt;<o:p></o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; No RPL artif=
act<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Figure 20: Example Compressed Packet with SRH<o:p></o:p></pr=
e>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Data is removed from the left as consumed. Removing =
the IP-in-IP removes everything left of it including RPI.<o:p></o:p></p>
<p class=3D"MsoNormal">What gets forwarded to the unaware leaf starts at th=
e LOWPAN_IPHC.
<o:p></o:p></p>
<p class=3D"MsoNormal">What&#8217;s worth noting is that in Storing Mode th=
e SRH contains the address of the 6LR that decapsulates.<o:p></o:p></p>
<p class=3D"MsoNormal">IOW the SRH encodes the destination of IP-in-IP, whe=
reas the root is the source so the encapsulator in the IP-in-IP 6LoRH is el=
ided&#8230;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All the best,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: 6LoRH type in useofRPLinfo
Thread-Index: AdUw3XSCsslxmm7SSOSYMeH+zXkgcQAAjLPA
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Subject: Re: [Roll] 6LoRH type in useofRPLinfo
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Dear all

Actually since there is only one entry in the SRH the drawing in fig 20 of =
RFC 8138 must be adapted for a size of 0 (meaning 1 entry) and a total leng=
th of 4 octets.







+-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...

 |11110001|SRH-6LoRH| RPI-  | IP-in-IP | NH=3D1      |11110CPP| UDP | UDP

 |Page 1  |Type1 S=3D0| 6LoRH |  6LoRH   |LOWPAN_IPHC| UDP    | hdr |Payld

 +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-...

          <-4bytes->                    <-        RFC 6282<https://tools.ie=
tf.org/html/rfc6282>      ->

                                                No RPL artifact


All the best,

Pascal

From: Pascal Thubert (pthubert)
Sent: mardi 2 juillet 2019 16:07
To: 'Routing Over Low power and Lossy networks' <roll@ietf.org>
Subject: 6LoRH type in useofRPLinfo

Dear all

Reviewing again https://tools.ietf.org/html/draft-ietf-roll-useofrplinfo-25=
 I think we made a mistake in Fig 3:

The format of RFC 8138 compressed packet is presented as:

   +--+-----+---+--------------+-----------+-----------+-----------+
   |1 | 0|0 |TSE| 6LoRH Type 6 | Hop Limit | RPI-6LoRH |LOWPAN IPHC|
   +--+-----+---+--------------+-----------+-----------+-----------+

But it should really be as fig 20 in RFC 8138, meaning the RPI is before th=
e IP-in-IP:




+-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...

 |11110001|SRH-6LoRH| RPI-  | IP-in-IP | NH=3D1      |11110CPP| UDP | UDP

 |Page 1  |Type1 S=3D2| 6LoRH |  6LoRH   |LOWPAN_IPHC| UDP    | hdr |Payld

 +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-...

            <-8bytes->                  <-        RFC 6282<https://tools.ie=
tf.org/html/rfc6282>      ->

                                                No RPL artifact



               Figure 20: Example Compressed Packet with SRH

Data is removed from the left as consumed. Removing the IP-in-IP removes ev=
erything left of it including RPI.
What gets forwarded to the unaware leaf starts at the LOWPAN_IPHC.
What's worth noting is that in Storing Mode the SRH contains the address of=
 the 6LR that decapsulates.
IOW the SRH encodes the destination of IP-in-IP, whereas the root is the so=
urce so the encapsulator in the IP-in-IP 6LoRH is elided...

All the best,

Pascal




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<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Actually since there is only one entry in the SRH th=
e drawing in fig 20 of RFC 8138 must be adapted for a size of 0 (meaning 1 =
entry) and a total length of 4 octets.<o:p></o:p></p>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&#43;-&#43; ... -&#43;-&#43; ... &#43;-&#43;- ... -&#43;-&#43;- ... &#=
43;-&#43;-&#43;-&#43; ... &#43;-&#43;-&#43; ... -&#43; ... &#43;-...<o:p></=
o:p></pre>
<pre> |11110001|SRH-6LoRH| RPI-&nbsp; | IP-in-IP | NH=3D1&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; |11110CPP| UDP | UDP<o:p></o:p></pre>
<pre> |Page 1&nbsp; |Type1 S=3D0| 6LoRH |&nbsp; 6LoRH&nbsp;&nbsp; |LOWPAN_I=
PHC| UDP&nbsp;&nbsp;&nbsp; | hdr |Payld<o:p></o:p></pre>
<pre> &#43;-&#43; ... -&#43;-&#43; ... &#43;-&#43;- ... -&#43;-&#43;-- ... =
-&#43;-&#43;-&#43; ... &#43;-&#43;-&#43; ... -&#43; ... &#43;-...<o:p></o:p=
></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;-4byte=
s-&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; <a href=3D"https://tools.ietf.org/html/rfc6282">RFC 6282</a>&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -&gt;<o:p></o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; No RPL artif=
act<o:p></o:p></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">All the best,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Pascal Thubert (pthubert) <br>
<b>Sent:</b> mardi 2 juillet 2019 16:07<br>
<b>To:</b> 'Routing Over Low power and Lossy networks' &lt;roll@ietf.org&gt=
;<br>
<b>Subject:</b> 6LoRH type in useofRPLinfo<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Reviewing again <a href=3D"https://tools.ietf.org/ht=
ml/draft-ietf-roll-useofrplinfo-25">
https://tools.ietf.org/html/draft-ietf-roll-useofrplinfo-25</a> I think we =
made a mistake in Fig 3:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The format of RFC 8138 compressed packet is presente=
d as:<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; &#43;--&#43;-----&#43;---&#43;--------------&=
#43;-----------&#43;-----------&#43;-----------&#43;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; |1 | 0|0 |TSE| 6LoRH Type 6 | Hop Limit | RPI=
-6LoRH |LOWPAN IPHC|<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; &#43;--&#43;-----&#43;---&#43;--------------&=
#43;-----------&#43;-----------&#43;-----------&#43;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">But it should really be as fig 20 in RFC 8138, meani=
ng the RPI is before the IP-in-IP:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&#43;-&#43; ... -&#43;-&#43; ... &#43;-&#43;- ... -&#43;-&#43;- ... &#=
43;-&#43;-&#43;-&#43; ... &#43;-&#43;-&#43; ... -&#43; ... &#43;-...<o:p></=
o:p></pre>
<pre> |11110001|SRH-6LoRH| RPI-&nbsp; | IP-in-IP | NH=3D1&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; |11110CPP| UDP | UDP<o:p></o:p></pre>
<pre> |Page 1&nbsp; |Type1 S=3D2| 6LoRH |&nbsp; 6LoRH&nbsp;&nbsp; |LOWPAN_I=
PHC| UDP&nbsp;&nbsp;&nbsp; | hdr |Payld<o:p></o:p></pre>
<pre> &#43;-&#43; ... -&#43;-&#43; ... &#43;-&#43;- ... -&#43;-&#43;-- ... =
-&#43;-&#43;-&#43; ... &#43;-&#43;-&#43; ... -&#43; ... &#43;-...<o:p></o:p=
></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt=
;-8bytes-&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; <a href=3D"https://tools.ietf.org/html/rfc6282">RFC 6282</a>&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -&gt;<o:p></o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; No RPL artif=
act<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Figure 20: Example Compressed Packet with SRH<o:p></o:p></pr=
e>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Data is removed from the left as consumed. Removing =
the IP-in-IP removes everything left of it including RPI.<o:p></o:p></p>
<p class=3D"MsoNormal">What gets forwarded to the unaware leaf starts at th=
e LOWPAN_IPHC.
<o:p></o:p></p>
<p class=3D"MsoNormal">What&#8217;s worth noting is that in Storing Mode th=
e SRH contains the address of the 6LR that decapsulates.<o:p></o:p></p>
<p class=3D"MsoNormal">IOW the SRH encodes the destination of IP-in-IP, whe=
reas the root is the source so the encapsulator in the IP-in-IP 6LoRH is el=
ided&#8230;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All the best,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From: Remous-Aris Koutsiamanis <aris@ariskou.com>
Date: Tue, 2 Jul 2019 17:39:55 +0200 (CEST)
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: "dominique.barthel@orange.com" <dominique.barthel@orange.com>,  Routing Over Low power and Lossy networks <roll@ietf.org>,  "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>
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Subject: Re: [Roll] I-D Action: draft-ietf-roll-nsa-extension-02.txt
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Hello again,

just two really quick clarifications...

On Mon, Jul 1, 2019 at 7:52 PM Pascal Thubert (pthubert) <pthubert@cisco.co=
m>
wrote:

> I agree 100% with Dominique.
>
> I d remove the text altogether since there is no compression RFC and that
> would block this draft.
>

You propose to remove the whole section regarding the compression?
(https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-03#section-4.2
<https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-03#section-4.2>)


>
> And... Let=E2=80=99s start the PL control plane compression draft!
>

What does PL stand for here? You maybe mistyped RPL?
And if yes, this would a wider effort, right?

Best,
Aris

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<div dir=3D"ltr"><div>Hello again,<br></div><div><br></div><div>just two re=
ally quick clarifications...<br></div><div><br></div><div class=3D"gmail_qu=
ote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Jul 1, 2019 at 7:52 PM P=
ascal Thubert (pthubert) &lt;<a href=3D"mailto:pthubert@cisco.com">pthubert=
@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">



<div dir=3D"auto">
I agree 100% with Dominique.
<div><br>
<div>I d remove the text altogether since there is no compression RFC and t=
hat would block this draft.<br></div></div></div></blockquote><div><br></di=
v><div>You propose to remove the whole section regarding the compression? <=
a href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-03#sect=
ion-4.2" target=3D"_blank">(https://tools.ietf.org/html/draft-ietf-roll-nsa=
-extension-03#section-4.2</a>)<br></div><div>=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div dir=3D"auto"><div><div>
<br>
<div dir=3D"ltr">
<div>And... Let=E2=80=99s start the PL control plane compression draft!</di=
v></div></div></div></div></blockquote><div><br></div><div>What does PL sta=
nd for here? You maybe mistyped RPL?</div><div>And if yes, this would a wid=
er effort, right?<br></div><div>=C2=A0</div>Best,</div><div class=3D"gmail_=
quote">Aris<br></div></div>

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Subject: [Roll] I-D Action: draft-ietf-roll-unaware-leaves-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 Routing Over Low power and Lossy networks WG of the IETF.

        Title           : Routing for RPL Leaves
        Author          : Pascal Thubert
	Filename        : draft-ietf-roll-unaware-leaves-01.txt
	Pages           : 20
	Date            : 2019-07-02

Abstract:
   This specification leverages 6LoWPAN ND to provide a unicast and
   multicast routing service in a RPL domain to 6LNs that do not
   participate to RPL.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-roll-unaware-leaves/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-roll-unaware-leaves-01
https://datatracker.ietf.org/doc/html/draft-ietf-roll-unaware-leaves-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-roll-unaware-leaves-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.

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ftp://ftp.ietf.org/internet-drafts/


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Date: Tue, 2 Jul 2019 11:40:15 -0500
From: Benjamin Kaduk <kaduk@mit.edu>
To: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
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Subject: Re: [Roll] Benjamin Kaduk's No Objection on draft-ietf-roll-efficient-npdao-12: (with COMMENT)
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On Mon, Jul 01, 2019 at 12:51:22AM +0000, Rahul Arvind Jadhav wrote:
> Thank you Benjamin for the detailed review and the comments.
> Please find my responses inline.
> 
> Thanks,
> Rahul
> 
> ----------------------------------------------------------------------
> COMMENT:
> ----------------------------------------------------------------------
> 
> I think that we need greater clarity about whether the DCOSequence number is just a series of monotonic (i.e., time-ordered) nonces (to be echoed back for matching request/response) or a full-on sequence counter that allows for loss detection as well as providing in-order delivery.
> It sounds like we just need the time-ordering and single-use properties, but I'm not entirely sure.  I wavered about making this a Discuss point but ended up not doing so since I'm not sure how much harm is being risked.  (I also mention this topic a couple times in the section-by-section comments below.)
> 
> [RJ] The DCOSequence is not expected to provide in-order delivery. The receiver
> is simply expected to echo back the DCOSequence whatever is received which
> informs the sender that the info is received. Even if received un-ordered the receiver is expected to just ack the rcvd DCO.

Okay, so it seems like the risk here would just be if a receiver
mis-implemented and expected sequential behavior.  I know Roman had also
mentioned this topic in his ballot, and I see you propose to make some
changes down in the Comment where I mentioned this; thanks!

> I agree with Barry that the Abstract is really hard to parse.
> 
> [RJ] Yes. We had updated the abstract as per Barry's suggestion.
> 
> Section 1.2
> 
>    RPL uses NPDAO messaging in the storing mode so that the node
>    changing it routing adjacencies can invalidate the previous route.
> 
> nit: "its routing adjacencies"
> 
> [RJ] Fixed
> 
>    This is needed so that nodes along the previous path can release any
>    resources (such as the routing entry) it maintains on behalf of
>    target node.
> 
> nit: singular/plural mismatch "nodes"/"it maintains"
> [RJ] changed "it maintains" to "they maintain"
> 
> Section 4.1
> 
>                                                             When node A
>    receives the regular DAO, it finds that it already has a routing
>    table entry on behalf of the target address of node D.  It finds
>    however that the next hop information for reaching node D has changed
>    i.e., node D has decided to change the paths.  In this case, Node A
>    which is the common ancestor node for node D along the two paths
>    (previous and new), should generate a DCO which traverses downwards
>    in the network.
> 
> I can't decide whether or not it helps readability to reiterate that in addition to creating the DCO, node A also does normal DAO processing (e.g., forwarding to the 6LBR).  I guess the example in A.1 does show this normal processing, so maybe it's overkill to also do so here.
> 
> [RJ] As you hinted, It would be better for the sake of completeness to add DAO processing point here as well. I have added a statement saying, "Node A handles normal DAO forwarding to
> 6LBR as required by the RFC6550."

Thanks!

> Section 4.2
> 
>                Transit Information Option should be carried in the DAO
>    message with I-flag set in case route invalidation is sought for the
>    corresponding target(s).
> 
> nit: this text as written implies thatthe I-flag is set in the DAO itself, not the TIO therein.
> 
> [RJ] Updated to say, "Transit Information Option with I-flag set should be carried in the DAO message when route invalidation is sought ..."
> 
> I'd also suggest to s/in case/when/ for clarity.
> 
> [RJ] Fixed as mentioned above.
> 
>    The common ancestor node SHOULD generate a DCO message in response to
>    this I-flag when it sees that the routing adjacencies have changed
>    for the target.  I-flag governs the ownership of the DCO message in a
>    way that the target node is still in control of its own route
>    invalidation.
> 
> nit: "The I-flag" (start of last sentence).
> 
> [RJ] Fixed
> 
> I'd further suggest rewording to something like "The I-flag is intended to give the target node control over its own route invalidation, serving as a signal to request DCO generation; in normal operation a DCO would not otherwise be generated"; the current text about "ownership" has some weird connotations/implications and this text also implicitly assumes that DAO/TIO/I-flag will never be maliciously generated.  It is also a little weaker about unsolicited DCO, per Section 4.5
> 
> [RJ] Have updated the text, " The I-flag is intended to give the target node control over its own route invalidation, serving as a signal to request DCO generation."
> I have avoided to say "in normal operation a DCO would not otherwise be generated" especially given the case of unsolicited DCO.

That's a good point (I hadn't quite gotten to unsolicited DCO when I  wrote
this comment).

> Section 4.3
> 
>    A new ICMPv6 RPL control message type is defined by this
>    specification called as "Destination Cleanup Object" (DCO), which is
> 
> nit: either "called" or "known as" or "referred to as" would be fine; "called as" is a grammatical mismatch.
> 
> [RJ] fixed. using "referred to as"
> 
>    DCOSequence: Incremented at each unique DCO message from a node and
>    echoed in the DCO-ACK message.  The initial DCOSequence can be chosen
>    randomly by the node.
> 
> What's the behavior if a sequence number is skipped?  (Why do we have a sequence number if we aren't going to detect and act on this condition?) Ah, I see Section 4.3.3, but perhaps a forward-reference is in order.
> 
> [RJ] Added a forward-reference.
> 
> Section 4.3.4
> 
> It seems that the "Reserved" field should be called "Flags", since a registry is being created for it.
> 
> [RJ] Yes, changed the "Reserved" field name to "Flags" in both the figure as well as the description below.
> 
> (I trust that the language about the D flag and DODAGID optionality from Barry's ballot thread is consistent between DCO and DCO-ACK.)
> 
> [RJ] Yes the DODAGID optionality statement is fixed in both the places as per Barry's suggestion. Thanks for reminding about the two places to fix.
> 
> Section 4.4
> 
>    1.  If a node sends a DCO message with newer or different information
>        than the prior DCO message transmission, it MUST increment the
>        DCOSequence field by at least one.  A DCO message transmission
>        that is identical to the prior DCO message transmission MAY
>        increment the DCOSequence field.
> 
> While reading up to this point I managed to confuse myself about Path Sequence (which must be consistent from DAO to DCO) and the separate DAOSequence and DCOSequence fields.  To check my (less confused) understanding, I guess if I could over-summarize, Path Sequence is like a generation counter for a given node's position in the routing topology, and the other two are for managing retransmission/ack of the respective update messages.  So if that mental model is correct, then there's not any value from trying to introduce a shared sequence number space for DCO and DAO, even though they are frequently going to be generated at the same time, especially since they have different recipients.  Right?
> 
> [RJ] The DAOSequence and DCOSequence are not dependent on each other at all.
> Yes, the DAO could be generated and DCO could be generated at the same time for
> different recipients.

Thanks for confirming.

> I do agree with the other discussion that we need clarity about whether the increment is exactly one or larger values are allowed (plus, presumably, whether the recipient should infer anything from a sequence number gap).  I do note that these are expected to be "lollipop sequence counters" per RFC 6550.
> 
> [RJ] This will be fixed i.e., we will make it explicit about the sequence
> counter operation and add a ref to the corresponding section in 6550.
> 
>    4.  A node receiving a unicast DCO message with the 'K' flag set
>        SHOULD respond with a DCO-ACK.  A node receiving a DCO message
>        without the 'K' flag set MAY respond with a DCO-ACK, especially
>        to report an error condition.
> 
> This seems redundant with Section 4.3's "A node receiving a DCO message without the 'K' flag set MAY respond with a DCO-ACK, especially to report an error condition."
> 
> [RJ] Yes it is redundant. But i feel it is better to have it in both places.
> The statements are consistent with each other.

Okay.  (I only mention it because we generally try to take note of such
redundancy; it's only a problem in practice when the two statements don't
quite agree with each other and there's no way to tell which one is
correct.)

> Section 4.4
> 
>    The scope of DCOSequence values is unique to each node.
> 
> recipient or originator?
> 
> [RJ] Changed this to, "The scope of DCOSequence values is unique to the node
> which generates it."
> 
> Section 4.5
> 
>    path on behalf of the target entry.  The 6LR has all the state
>    information namely, the Target address and the Path Sequence,
> 
> nit: comma before "namely".
> 
> [RJ] Fixed
> 
> Section 4.6.2
> 
>    Even with the changed semantics, the current NPDAO mechanism in
>    [RFC6550] can still be used, for example, when the route lifetime
>    expiry of the target happens or when the node simply decides to
>    gracefully terminate the RPL session on graceful node shutdown.
> 
> Er, what changed semantics?  This document does not have an Updates:
> relationship to any other document.
> 
> [RJ] I have reworded the section removing the statement, "Even with the changed
> semantics". Also (I believe) the section is more readable now.

Great :)

> Section 4.6.3
> 
>    Note that there is no requirement of synchronization between DCO and
>    DAOs.  The DelayDCO timer simply ensures that the DCO control
>    overhead can be reduced and is only needed when the network contains
>    nodes using multiple preferred parent.
> 
> This ("no requirement of synchronization") is because the benefit of DCO is in expiring routes faster than their normal expiration time to save local storage, rather than to provide synchronous route migration?  (It might be worth reiterating, if you want.)
> 
> [RJ] Sorry, but i didn't understand this. I didn't understand why the statement
> "the benefits of DCO is in expiring routes faster than their normal expiration
> time ...." should be mentioned in this context? NPDAO and DCO both are
> proactive route invalidation messaging techniques and they both help in expiring
> routes faster than their normal expiration times. DCO simply is more reliable
> due to its use on more reliable links.

Sorry for being unclear.  I was not proposing any text changes here, just
trying to check my understanding about "no requirement of synchronization".
But basically I think it's all just "both NPDAO and DCO are both ways to
expire cached information quickly when it becomes invalid, and if either
one works we have succeeded; we don't need both to reach any given node".

> Section 7
> 
>    This document introduces the ability for a common ancestor node to
>    invalidate a route on behalf of the target node.  The common ancestor
>    node is directed to do so by the target node using the 'I' flag in
>    DCO's Transit Information Option.  However, the common ancestor node
> 
> nit(?): there's perhaps some wordsmithing possible about "is directed to do so", given the next sentence and Section 4.5.
> 
> [RJ] I changed the statement, "The common ancestor node is directed to do so by
> the target node ..." to "The common ancestor node could be directed to do so by
> the target node ..."
> 
>    is also met.  Having said that a malicious 6LR may spoof a DAO on
>    behalf of the (sub) child with the I-flag set and can cause route
>    invalidation on behalf of the (sub) child node.
> 
> IIUC, such a malicious 6LR might also spoof a DAO even without this mechanism (to invalidate the "proper" Path Sequence) or otherwise cause denial of service by dropping traffic entirely, so perhaps we want to add another clause ", so this new mechanism does not present a substantially increased risk of disruption".
> 
> [RJ] Reworded and added new statements based on your suggestions to this para.
> 
>    This document assumes that the security mechanisms as defined in
>    [RFC6550] are followed, which means that the common ancestor node and
>    all the 6LRs are part of the RPL network because they have the
>    required credentials.  A non-secure RPL network needs to take into
>    consideration the risks highlighted in this section.
> 
> I'd consider adding "as well as those highlighted in [RFC6550]" to the end.
> 
> [RJ] Added the mentioned words to the end of the para.
> 
> Appendix A.1
> 
>    6.  Node G receives the DCO(tgt=D,pathseq=x+1).  It checks if the
>        received path sequence is latest as compared to the stored path
>        sequence.  If it is latest, Node G invalidates routing entry of
>        target D and forwards the (un)reachability information downstream
>        to B in DCO(tgt=D,pathseq=x+1).
> 
> This wording of "latest as compared to" feels unusual to me; I would have expected "is later than the stored path sequence" and "If it is later", but perhaps there is a convention here that I'm missing.
> 
> [RJ] I could not find a general convention here (after checking in 6550), so I
> changed it per your suggestion to use "later" in both the statements.
> 
> nit: "invalidates the routing entry"
> 
> [RJ] Fixed.
> 
>    9.  The propagation of the DCO will stop at any node where the node
>        does not have an routing information associated with the target.
>        If the routing information is present and its Path Sequence is
>        higher, then still the DCO is dropped.
> 
> nit: maybye reword to "If cached routing information is present and the cached Path Sequence is higher than the value in the DCO, then the DCO is dropped".
> 
> [RJ] This sounds lot better. Thanks for the text.
> 
> Appendix A.2
> 
> I feel like we should probably mention the DelayDAO timer as well as the DelayDCO one.
> 
> I think this is a side note, but it seems like the timer mechanism for DelayDAO (and by extension, DelayDCO) are a bit fragile, as one party has to wait for the full timeout before sending the message (e.g., N22 in this example) that the other party is waiting the timeout to receive (e.g., N11).  So it seems like we are still susceptible to transport delay/jitter and race conditions at some point in the network, even if it's not the next-hop of the target node.  But if that's a property of DelayDAO from RFC 6550, it doesn't really make sense to try to address it in this document (and it's also possible I misunderstand the situation).
> 
> [RJ] DelayDAO and DelayDCO are mechanisms to reduce the control overhead in the
> network. If an implementation chooses not to use it, it will still work ok,
> albeit with more control overhead. Yes the DelayDCO is modeled similar to
> DelayDAO and it is expected that a node simply waits for the timer to expire
> before it could start sending the corresponding message (DCO is this case, DAO
> in case of 6550). I am not fully sure if I completely understand what you mean
> by "susceptibility to transport delay/jitter" but i understand that there could
> be race conditions. If the race conditions happen the worst case problem would
> be slightly more control overhead. Race condition would not result in invalid
> states on any nodes.

I'm happy to trust that you've thought about the race conditions and they
don't cause any real problems.  For completeness, though, I was just
considering the case when the DAO from N22 to N11 arrives before/after the
timout fires on N11, whether N11 would then try to send a DCO down and what
would happen then.

Thanks for all the updates!

-Ben


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Subject: [Roll] Constrained Node/Network Cluster @ IETF105: FINAL AGENDA
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Here is my usual eclectic condensed agenda based on the FINAL AGENDA
for IETF105.  Remember that, even though this will now go to the
printers, there is still some potential for changes.

Conflicts that meet the eye:  COSE/TEEP stays;
ROLL/SUIT/DINRG and 6TISCH/ACE are maybe slightly less annoying.
LAKE and LOOPS have been disentangled, thank you.

I have put in some side meetings, but that picture may still change
(and I don't understand the timezone logic of that system, so it may
be all wrong).

All times are EDT (Eastern Daylight Time) =3D=3D UTC -4 hours.
(Pure UTC times at https://datatracker.ietf.org/meeting/agenda-utc are
useful for those who want to listen from remote.)

Gr=C3=BC=C3=9Fe, Carsten

FRIDAY, July 19, 2019
-- OMA/T2TRG Work Meeting - @ Ericsson Montreal Office (St-Laurent)

SATURDAY/SUNDAY, July 20/21, 2019
-- Hackathon (including various interops) - Centre Ville

SUNDAY, July 21, 2019
-- Sun 1700-1900  Welcome Reception - Place du Canada
-- Sun 1800-2000  Hot RFC Lightning Talks - Viger

MONDAY, July 22, 2019

1000-1200  Morning Session I
Van Horne	SEC	acme	Automated Certificate Management =
Environment WG
St-Catherine	SEC ***	teep	Trusted Execution Environment =
Provisioning WG
Laurier 	TSV	loops	Local Optimizations on Path Segments BOF

1330-1530  Afternoon Session I
St-Catherine	INT ***	6lo	IPv6 over Networks of =
Resource-constrained Nodes WG
Place du Canada	SEC	secdispatch	Security Dispatch WG
Van Horne	TSV	taps	Transport Services WG

1550-1750  Afternoon Session II
Laurier 	ART	httpbis	Hypertext Transfer Protocol WG
St-Catherine	OPS	v6ops	IPv6 Operations WG
Van Horne	SEC ***	lake	Lightweight Authenticated Key Exchange =
BOF

1810-1910  Afternoon Session III
Laurier 	ART	dispatch	Dispatch WG - Joint with ARTAREA

TUESDAY, July 23, 2019

0830-0945  Side Meetings / Open Time
C2 (21st Floor)                 IoT Onboarding and MUD (0900..1030?)
Place du Canada	IETF	tdd	Technology Deep Dive  - How NICs Work =
Today

1000-1200  Morning Session I
St-Catherine	ART ***	cbor	Concise Binary Object Representation =
Maintenance and Extensions WG - 1000-1130
St-Catherine	INT	ipwave	IP Wireless Access in Vehicular =
Environments WG - 1130-1200
Notre Dame	IRTF	icnrg	Information-Centric Networking
Duluth  	OPS	anima	Autonomic Networking Integrated Model =
and Approach WG
Van Horne	SEC	cacao	Collaborative Automated Course of Action =
Operations for Cyber Security BOF
Place du Canada	TSV	quic	QUIC WG

1330-1500  Afternoon Session I
Centre Ville	OPS	anima	Autonomic Networking Integrated Model =
and Approach WG

1520-1650  Afternoon Session II
Duluth  	INT	intarea	Internet Area Working Group WG
Place du Canada	IRTF	irtfopen	IRTF Open Meeting
Van Horne	SEC	oauth	Web Authorization Protocol WG
Collier                         CoRAL side meeting (1500..1700?)

1710-1810  Afternoon Session III
Duluth  	ART ***	core	Constrained RESTful Environments WG
Laurier 	INT	6man	IPv6 Maintenance WG
Place du Canada	SEC	tls	Transport Layer Security WG

WEDNESDAY, July 24, 2019

1000-1200  Morning Session I
Van Horne	IRTF***	dinrg	Decentralized Internet Infrastructure
St-Catherine	RTG ***	roll	Routing Over Low power and Lossy =
networks WG
Viger   	SEC ***	suit	Software Updates for Internet of Things =
WG
Place du Canada	TSV	quic	QUIC WG

1330-1530  Afternoon Session I
Place du Canada	GEN	netrqmts	IETF Meeting Network =
Requirements BOF
Laurier 	IRTF	pearg	Privacy Enhancements and Assessments =
Research Group
Viger   	IRTF***	t2trg	Thing-to-Thing
St-Catherine	RTG	bier	Bit Indexed Explicit Replication WG
Centre Ville	RTG	detnet	Deterministic Networking WG

1550-1650  Afternoon Session II
St-Catherine	RTG	babel	Babel routing protocol WG
Centre Ville	RTG	detnet	Deterministic Networking WG
Van Horne	SEC ***	rats	Remote ATtestation ProcedureS WG

THURSDAY, July 25, 2019

1000-1200  Morning Session I
Duluth  	ART ***	core	Constrained RESTful Environments WG
Place du Canada	SEC	tls	Transport Layer Security WG
Laurier 	TSV	tsvwg	Transport Area Working Group WG

1330-1530  Afternoon Session I
Duluth  	INT	dnssd	Extensions for Scalable DNS Service =
Discovery WG
Viger   	IRTF	coinrg	Computing in the Network Proposed =
Research Group
Laurier 	IRTF	panrg	Path Aware Networking RG
Place du Canada	SEC	saag	Security Area Open Meeting

1550-1720  Afternoon Session II
Laurier 	ART	httpbis	Hypertext Transfer Protocol WG
Duluth  	INT	6man	IPv6 Maintenance WG
Place du Canada	IRTF	cfrg	Crypto Forum
Van Horne	RTG	rift	Routing In Fat Trees WG
St-Catherine	SEC ***	rats	Remote ATtestation ProcedureS WG
Centre Ville	TSV	tsvarea	Transport Area Open Meeting

1740-1910  Afternoon Session III
Duluth  	INT ***	6tisch	IPv6 over the TSCH mode of IEEE =
802.15.4e WG
Centre Ville	SEC ***	ace	Authentication and Authorization for =
Constrained Environments WG
Place du Canada	SEC	mls	Messaging Layer Security WG
St-Catherine	TSV	rmcat	RTP Media Congestion Avoidance =
Techniques WG

FRIDAY, July 26, 2019

1000-1200  Morning Session I
Notre Dame	ART	ice	Interactive Connectivity Establishment =
WG
Centre Ville	INT ***	lpwan	IPv6 over Low Power Wide-Area Networks =
WG
Place du Canada	IRTF	maprg	Measurement and Analysis for Protocols
Laurier 	SEC	mls	Messaging Layer Security WG
Duluth  	SEC	oauth	Web Authorization Protocol WG

1220-1350  Afternoon Session I
Van Horne	SEC ***	cose	CBOR Object Signing and Encryption WG
St-Catherine	SEC ***	teep	Trusted Execution Environment =
Provisioning WG
Place du Canada	TSV	tsvwg	Transport Area Working Group WG


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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: Routing Over Low power and Lossy networks <roll@ietf.org>, draft-ietf-roll-useofrplinfo@ietf.org,  Peter van der Stok <consultancy@vanderstok.org>, roll-chairs <roll-chairs@ietf.org>
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Subject: Re: [Roll] 6LoRH type in useofRPLinfo
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Pascal:

We=E2=80=99re already at version -30.  Please take a look at the text there=
 =E2=80=94 the
figure in the corresponding section (=C2=A74.3) now looks like this:

 +-+ ... -+-+-...-+-+-- ... -+-+-+-+- ... -+-+ ... -+-+-+ ... -+-+-+...
 |11110001| RPI-  | IP-in-IP | NH=3D1        |11110CPP| Compressed | UDP
 |Page 1  | 6LoRH |  6LoRH   | LOWPAN_IPHC | UDP    | UDP header | Payld
 +-+ ... -+-+-...-+-+-- ... -+-+-+-+- ... -+-+ ... -+-+-+ ... -+-+-+...


Is that correct?  If not, please provide an update.

I am getting ready to approve this document.  I am changing the state
to =E2=80=9CRevised-ID Needed=E2=80=9D =E2=80=94 let me know if a change is=
 not needed.

Thanks!

Alvaro.


On July 2, 2019 at 10:14:53 AM, Pascal Thubert (pthubert) (
pthubert@cisco.com) wrote:

Dear all



Actually since there is only one entry in the SRH the drawing in fig 20 of
RFC 8138 must be adapted for a size of 0 (meaning 1 entry) and a total
length of 4 octets.







+-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...

 |11110001|SRH-6LoRH| RPI-  | IP-in-IP | NH=3D1      |11110CPP| UDP | UDP

 |Page 1  |Type1 S=3D0| 6LoRH |  6LoRH   |LOWPAN_IPHC| UDP    | hdr |Payld

 +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-...

          <-4bytes->                    <-        RFC 6282
<https://tools.ietf.org/html/rfc6282>      ->

                                                No RPL artifact





All the best,



Pascal



*From:* Pascal Thubert (pthubert)
*Sent:* mardi 2 juillet 2019 16:07
*To:* 'Routing Over Low power and Lossy networks' <roll@ietf.org>
*Subject:* 6LoRH type in useofRPLinfo



Dear all



Reviewing again https://tools.ietf.org/html/draft-ietf-roll-useofrplinfo-25
I think we made a mistake in Fig 3:



The format of RFC 8138 compressed packet is presented as:



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

   |1 | 0|0 |TSE| 6LoRH Type 6 | Hop Limit | RPI-6LoRH |LOWPAN IPHC|

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



But it should really be as fig 20 in RFC 8138, meaning the RPI is before
the IP-in-IP:





+-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...

 |11110001|SRH-6LoRH| RPI-  | IP-in-IP | NH=3D1      |11110CPP| UDP | UDP

 |Page 1  |Type1 S=3D2| 6LoRH |  6LoRH   |LOWPAN_IPHC| UDP    | hdr |Payld

 +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-...

            <-8bytes->                  <-        RFC 6282
<https://tools.ietf.org/html/rfc6282>      ->

                                                No RPL artifact



               Figure 20: Example Compressed Packet with SRH



Data is removed from the left as consumed. Removing the IP-in-IP removes
everything left of it including RPI.

What gets forwarded to the unaware leaf starts at the LOWPAN_IPHC.

What=E2=80=99s worth noting is that in Storing Mode the SRH contains the ad=
dress of
the 6LR that decapsulates.

IOW the SRH encodes the destination of IP-in-IP, whereas the root is the
source so the encapsulator in the IP-in-IP 6LoRH is elided=E2=80=A6



All the best,



Pascal






_______________________________________________
Roll mailing list
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--000000000000b68026058ccdf62c
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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div style=3D"font-family:Helve=
tica,Arial;font-size:13px">Pascal:</div><div style=3D"font-family:Helvetica=
,Arial;font-size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;=
font-size:13px">We=E2=80=99re already at version -30.=C2=A0 Please take a l=
ook at the text there =E2=80=94 the figure in the corresponding section (=
=C2=A74.3) now looks like this:</div><div style=3D"font-family:Helvetica,Ar=
ial;font-size:13px"><br></div><div style=3D"margin:0px"><pre class=3D"newpa=
ge"><font face=3D"Courier"> +-+ ... -+-+-...-+-+-- ... -+-+-+-+- ... -+-+ .=
.. -+-+-+ ... -+-+-+...
 |11110001| RPI-  | IP-in-IP | NH=3D1        |11110CPP| Compressed | UDP
 |Page 1  | 6LoRH |  6LoRH   | LOWPAN_IPHC | UDP    | UDP header | Payld
 +-+ ... -+-+-...-+-+-- ... -+-+-+-+- ... -+-+ ... -+-+-+ ... -+-+-+...

</font></pre><pre class=3D"newpage" style=3D"font-size:13px"><font face=3D"=
Helvetica">Is that correct?  If not, please provide an update.</font></pre>=
<pre class=3D"newpage"><font face=3D"Helvetica">I am getting ready to appro=
ve this document.  I am changing the state to =E2=80=9CRevised-ID Needed=E2=
=80=9D =E2=80=94 let me know if a change is not needed.</font></pre><pre cl=
ass=3D"newpage"><font face=3D"Helvetica">Thanks!</font></pre><pre class=3D"=
newpage"><font face=3D"Helvetica">Alvaro.</font></pre><pre class=3D"newpage=
" style=3D"font-size:13px;font-family:Helvetica,Arial"><br></pre></div><p c=
lass=3D"airmail_on">On July 2, 2019 at 10:14:53 AM, Pascal Thubert (pthuber=
t) (<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>) wrote:</p=
> <blockquote type=3D"cite" class=3D"clean_bq"><span><div lang=3D"EN-US" li=
nk=3D"#0563C1" vlink=3D"#954F72"><div></div><div>






<div class=3D"WordSection1">
<p class=3D"MsoNormal">Dear all</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Actually since there is only one entry in the SRH th=
e drawing in fig 20 of RFC 8138 must be adapted for a size of 0 (meaning 1 =
entry) and a total length of 4 octets.</p>
<pre>=C2=A0</pre>
<pre>=C2=A0</pre>
<pre>=C2=A0</pre>
<pre>+-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...=
</pre>
<pre> |11110001|SRH-6LoRH| RPI-=C2=A0 | IP-in-IP | NH=3D1=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 |11110CPP| UDP | UDP</pre>
<pre> |Page 1=C2=A0 |Type1 S=3D0| 6LoRH |=C2=A0 6LoRH=C2=A0=C2=A0 |LOWPAN_I=
PHC| UDP=C2=A0=C2=A0=C2=A0 | hdr |Payld</pre>
<pre> +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-..=
.</pre>
<pre>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0&lt;-4byte=
s-&gt;=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 &lt;-=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 <a href=3D"https://tools.ietf.org/html/rfc6282">RFC 6282</a=
>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -&gt;</pre>
<pre>=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=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 No RPL arti=
fact</pre>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">=C2=A0</p>
<div>
<p class=3D"MsoNormal">All the best,</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Pascal</p>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Pascal Thubert (pthubert) <br>
<b>Sent:</b> mardi 2 juillet 2019 16:07<br>
<b>To:</b> &#39;Routing Over Low power and Lossy networks&#39; &lt;<a href=
=3D"mailto:roll@ietf.org">roll@ietf.org</a>&gt;<br>
<b>Subject:</b> 6LoRH type in useofRPLinfo</p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Dear all</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Reviewing again <a href=3D"https://tools.ietf.org/ht=
ml/draft-ietf-roll-useofrplinfo-25">
https://tools.ietf.org/html/draft-ietf-roll-useofrplinfo-25</a> I think we =
made a mistake in Fig 3:</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">The format of RFC 8138 compressed packet is presente=
d as:</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">=C2=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">=C2=A0=C2=A0 +--+-----+---+--------------+-----------+----=
-------+-----------+</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">=C2=A0=C2=A0 |1 | 0|0 |TSE| 6LoRH Type 6 | Hop Limit | RPI=
-6LoRH |LOWPAN IPHC|</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">=C2=A0=C2=A0 +--+-----+---+--------------+-----------+----=
-------+-----------+</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">=C2=A0</span></p>
<p class=3D"MsoNormal">But it should really be as fig 20 in RFC 8138, meani=
ng the RPI is before the IP-in-IP:</p>
<p class=3D"MsoNormal">=C2=A0</p>
<pre>=C2=A0</pre>
<pre>+-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...=
</pre>
<pre> |11110001|SRH-6LoRH| RPI-=C2=A0 | IP-in-IP | NH=3D1=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 |11110CPP| UDP | UDP</pre>
<pre> |Page 1=C2=A0 |Type1 S=3D2| 6LoRH |=C2=A0 6LoRH=C2=A0=C2=A0 |LOWPAN_I=
PHC| UDP=C2=A0=C2=A0=C2=A0 | hdr |Payld</pre>
<pre> +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-..=
.</pre>
<pre>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt=
;-8bytes-&gt;=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 &lt;-=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 <a href=3D"https://tools.ietf.org/html/rfc6282">RFC 6282</a=
>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -&gt;</pre>
<pre>=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=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 No RPL arti=
fact</pre>
<pre>=C2=A0</pre>
<pre>=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 Figure 20: Example Compressed Packet with SRH</pre>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Data is removed from the left as consumed. Removing =
the IP-in-IP removes everything left of it including RPI.</p>
<p class=3D"MsoNormal">What gets forwarded to the unaware leaf starts at th=
e LOWPAN_IPHC.
</p>
<p class=3D"MsoNormal">What=E2=80=99s worth noting is that in Storing Mode =
the SRH contains the address of the 6LR that decapsulates.</p>
<p class=3D"MsoNormal">IOW the SRH encodes the destination of IP-in-IP, whe=
reas the root is the source so the encapsulator in the IP-in-IP 6LoRH is el=
ided=E2=80=A6</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">All the best,</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">Pascal</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">=C2=A0</p>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
</div>


_______________________________________________
<br>Roll mailing list
<br><a href=3D"mailto:Roll@ietf.org">Roll@ietf.org</a>
<br><a href=3D"https://www.ietf.org/mailman/listinfo/roll">https://www.ietf=
.org/mailman/listinfo/roll</a>
<br></div></div></span></blockquote> <div class=3D"gmail_signature"></div><=
/body></html>

--000000000000b68026058ccdf62c--


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Subject: [Roll] I-D Action: draft-ietf-roll-efficient-npdao-14.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 Routing Over Low power and Lossy networks WG of the IETF.

        Title           : Efficient Route Invalidation
        Authors         : Rahul Arvind Jadhav
                          Pascal Thubert
                          Rabi Narayan Sahoo
                          Zhen Cao
	Filename        : draft-ietf-roll-efficient-npdao-14.txt
	Pages           : 22
	Date            : 2019-07-03

Abstract:
   This document explains the problems associated with the current use
   of NPDAO messaging and also discusses the requirements for an
   optimized route invalidation messaging scheme.  Further a new
   proactive route invalidation message called as "Destination Cleanup
   Object" (DCO) is specified which fulfills requirements of an
   optimized route invalidation messaging.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-roll-efficient-npdao/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-roll-efficient-npdao-14
https://datatracker.ietf.org/doc/html/draft-ietf-roll-efficient-npdao-14

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-roll-efficient-npdao-14


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: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
To: Benjamin Kaduk <kaduk@mit.edu>
CC: The IESG <iesg@ietf.org>, "draft-ietf-roll-efficient-npdao@ietf.org" <draft-ietf-roll-efficient-npdao@ietf.org>, Peter Van der Stok <consultancy@vanderstok.org>, "aretana.ietf@gmail.com" <aretana.ietf@gmail.com>, "roll-chairs@ietf.org" <roll-chairs@ietf.org>, "roll@ietf.org" <roll@ietf.org>
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Thank you Benjamin for the clarifications and rsp confirmations.
Also please find my reply [RJ] inline for the scenario you mentioned.

Thanks,
Rahul

>=20
> I think this is a side note, but it seems like the timer mechanism for De=
layDAO (and by extension, DelayDCO) are a bit fragile, as one party has to =
wait for the full timeout before sending the message (e.g., N22 in this exa=
mple) that the other party is waiting the timeout to receive (e.g., N11).  =
So it seems like we are still susceptible to transport delay/jitter and rac=
e conditions at some point in the network, even if it's not the next-hop of=
 the target node.  But if that's a property of DelayDAO from RFC 6550, it d=
oesn't really make sense to try to address it in this document (and it's al=
so possible I misunderstand the situation).
>=20
> [RJ] DelayDAO and DelayDCO are mechanisms to reduce the control=20
> overhead in the network. If an implementation chooses not to use it,=20
> it will still work ok, albeit with more control overhead. Yes the=20
> DelayDCO is modeled similar to DelayDAO and it is expected that a node=20
> simply waits for the timer to expire before it could start sending the=20
> corresponding message (DCO is this case, DAO in case of 6550). I am=20
> not fully sure if I completely understand what you mean by=20
> "susceptibility to transport delay/jitter" but i understand that there=20
> could be race conditions. If the race conditions happen the worst case=20
> problem would be slightly more control overhead. Race condition would not=
 result in invalid states on any nodes.

I'm happy to trust that you've thought about the race conditions and they d=
on't cause any real problems.  For completeness, though, I was just conside=
ring the case when the DAO from N22 to N11 arrives before/after the timout =
fires on N11, whether N11 would then try to send a DCO down and what would =
happen then.

[RJ] As you mentioned, there are two scenarios possible:
1. If the DAO from N22 to N11 arrives _before_ the DelayDCO timeout fires o=
n N11
This is the regular positive case. The DelayDCO timer is defined so that N1=
1 should be able to receive DAO from all possible paths before taking any a=
ction for route invalidation. If the DAO is received before DCO timer fires=
 then the routes are updates from all possible paths (by receiving DAOs fro=
m all possible paths) and thus the DCO should not be sent down.
2. If the DAO from N22 to N11 arrives _after_ the timeout fires on N11
This is the case where an unnecessary DCO will be generated by N11 because =
N11 has not still received the DAOs from all possible paths. In this case D=
CO will initiate route invalidation along the path through N22 and the segm=
ent which has not received updated DAO will be marked for invalidation. But=
 as soon as the new DAO reaches the paths would be updated again. So barrin=
g the unwanted control overhead of a DCO message, the routing state would b=
e consistent once the new DAO is received from all paths.

The second scenario was not explicitly covered in the document even though =
the handling was present. I thought it would be better to put this explicit=
 text after your comment.
I have added following in Section 4.6.3 :
	" It is still possible that a DCO is generated before all the updated=09
 	   DAOs from all the paths are received.  In this case, the ancestor=09
 	   node would start the invalidation procedure for paths from which the=09
 	   updated DAO is not received.  The DCO generated in this case would=09
 	   start invalidating the segments along these paths on which the=09
 	   updated DAOs are not received.  But once the DAO reaches these=09
 	   segments, the routing state would be updated along these segments and=
=09
 	   should not lead to any inconsistent routing state."


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Subject: [Roll] FW:  I-D Action: draft-ietf-roll-efficient-npdao-14.txt
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Hello All,

There are two updates in the document:
1. The table name in Section 6.2. was incorrect ... Before: DCO Status Code=
s .... After correction: DCO-ACK Status Codes
2. Benjamin Kaduk mentioned a scenario which is now explicitly described in=
 the document.

Regards,
Rahul

-----Original Message-----
From: Roll [mailto:roll-bounces@ietf.org] On Behalf Of internet-drafts@ietf=
.org
Sent: 04 July 2019 09:00
To: i-d-announce@ietf.org
Cc: roll@ietf.org
Subject: [Roll] I-D Action: draft-ietf-roll-efficient-npdao-14.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Routing Over Low power and Lossy networks =
WG of the IETF.

        Title           : Efficient Route Invalidation
        Authors         : Rahul Arvind Jadhav
                          Pascal Thubert
                          Rabi Narayan Sahoo
                          Zhen Cao
	Filename        : draft-ietf-roll-efficient-npdao-14.txt
	Pages           : 22
	Date            : 2019-07-03

Abstract:
   This document explains the problems associated with the current use
   of NPDAO messaging and also discusses the requirements for an
   optimized route invalidation messaging scheme.  Further a new
   proactive route invalidation message called as "Destination Cleanup
   Object" (DCO) is specified which fulfills requirements of an
   optimized route invalidation messaging.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-roll-efficient-npdao/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-roll-efficient-npdao-14
https://datatracker.ietf.org/doc/html/draft-ietf-roll-efficient-npdao-14

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-roll-efficient-npdao-14


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

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

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


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To: Routing Over Low power and Lossy networks <roll@ietf.org>, "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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On June 27, 2019 at 1:54:11 AM, Pascal Thubert (pthubert) (
pthubert@cisco.com) wrote:

Hi!

RPL is designed to operate in very different environment, and some LLNs can
be very slow, very lossy or even both. This is why RFC 6550 refrains from
being too specific.

Maybe it is good enough to add text indicating that the values used for DCO
are expected to be similar/consistent with those used in DAO?

I agree with Pascal.  In fact, the diversity of environments not only makes
it very hard to be too specific, but it is one of the reasons the WG has
produced Applicability Statements for them: not all deployments are the
same.

Thanks!

Alvaro.

--0000000000001224a6058cd8a8fa
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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div style=3D"margin:0px"><font=
 face=3D"Helvetica">On June 27, 2019 at 1:54:11 AM, Pascal Thubert (pthuber=
t) (<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>) wrote:</f=
ont></div><div style=3D"margin:0px"><font face=3D"Helvetica"><br></font></d=
iv><div style=3D"margin:0px"><font face=3D"Helvetica">Hi!</font></div><div =
style=3D"margin:0px"><font face=3D"Helvetica"><br></font></div> <div><block=
quote type=3D"cite" class=3D"clean_bq" style=3D"font-variant-caps:normal;le=
tter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;wh=
ite-space:normal;word-spacing:0px"><span><font face=3D"Helvetica"><p class=
=3D"MsoNormal" style=3D"margin:0cm 0cm 0.0001pt;color:rgb(0,0,0);font-varia=
nt-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;text-=
transform:none;white-space:normal;word-spacing:0px">RPL is designed to oper=
ate in very different environment, and some LLNs can be very slow, very los=
sy or even both. This is why RFC 6550 refrains from being too specific.</p>=
<p class=3D"MsoNormal" style=3D"margin:0cm 0cm 0.0001pt;color:rgb(0,0,0);fo=
nt-variant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0=
px;text-transform:none;white-space:normal;word-spacing:0px">Maybe it is goo=
d enough to add text indicating that the values used for DCO are expected t=
o be similar/consistent with those used in DAO?</p></font></span></blockquo=
te></div><p><font face=3D"Helvetica">I agree with Pascal.=C2=A0 In fact, th=
e diversity of environments not only makes it very hard to be too specific,=
 but it is one of the reasons the WG has produced Applicability Statements =
for them: not all deployments are the same.</font></p><p><font face=3D"Helv=
etica">Thanks!</font></p><p><font face=3D"Helvetica">Alvaro.</font></p><div=
><font face=3D"Helvetica"><br class=3D"Apple-interchange-newline"></font></=
div> <div class=3D"gmail_signature"></div></body></html>

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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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Hi,

My request wasn=E2=80=99t to specify this in detail for every scenario, =
it was to set boundaries about what's safe to do. The 3 seconds I =
mentions are the recommendation given in RFC8085, however, if you have a =
good reason to use different values that possible but it would be good =
to provide more reasoning then about when it is still safe to use the =
values and when it should be avoided.

Mirja


> On 4. Jul 2019, at 12:44, Alvaro Retana <aretana.ietf@gmail.com> =
wrote:
>=20
> On June 27, 2019 at 1:54:11 AM, Pascal Thubert (pthubert) =
(pthubert@cisco.com) wrote:
>=20
> Hi!
>=20
>> RPL is designed to operate in very different environment, and some =
LLNs can be very slow, very lossy or even both. This is why RFC 6550 =
refrains from being too specific.
>> Maybe it is good enough to add text indicating that the values used =
for DCO are expected to be similar/consistent with those used in DAO?
> I agree with Pascal.  In fact, the diversity of environments not only =
makes it very hard to be too specific, but it is one of the reasons the =
WG has produced Applicability Statements for them: not all deployments =
are the same.
>=20
> Thanks!
>=20
> Alvaro.
>=20
>=20


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Mirja Kuehlewind <ietf@kuehlewind.net>, Alvaro Retana <aretana.ietf@gmail.com>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Retrying DCO/DAO, retry parameters
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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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From nobody Thu Jul  4 04:27:49 2019
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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I think that is also a good additional to have. I would recommend to =
discus the boundaries in both directions: what the maximum rate I should =
ever to for in order to not permanently overload the network and what =
are the usual considerations to set these parameters correctly for my =
use case.

Mirja


> On 4. Jul 2019, at 13:22, Pascal Thubert (pthubert) =
<pthubert@cisco.com> wrote:
>=20
> You have a point there, Mirja.
>=20
> UDP over LLNs may have to live with durations that are 1 to 2 orders =
of magnitude longer than usual in more classical links these days. It =
can take a minute and more to get a message through.=20
>=20
> So yes, a bit of text that says that the typical latencies and =
turn-around-trip delays observed on the Internet and the default =
settings that derive from that may not apply in LLNs and need to be =
revisited depending on the link type and the number of hops in case of a =
mesh network.
>=20
> Is that what you are indicating to us?
>=20
> Pascal
>=20
>> -----Original Message-----
>> From: Mirja Kuehlewind <ietf@kuehlewind.net>
>> Sent: jeudi 4 juillet 2019 13:05
>> To: Alvaro Retana <aretana.ietf@gmail.com>; Pascal Thubert (pthubert)
>> <pthubert@cisco.com>
>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
>> Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
>>=20
>> Hi,
>>=20
>> My request wasn=E2=80=99t to specify this in detail for every =
scenario, it was to set
>> boundaries about what's safe to do. The 3 seconds I mentions are the
>> recommendation given in RFC8085, however, if you have a good reason =
to use
>> different values that possible but it would be good to provide more =
reasoning
>> then about when it is still safe to use the values and when it should =
be
>> avoided.
>>=20
>> Mirja
>>=20
>>=20
>>> On 4. Jul 2019, at 12:44, Alvaro Retana <aretana.ietf@gmail.com> =
wrote:
>>>=20
>>> On June 27, 2019 at 1:54:11 AM, Pascal Thubert (pthubert)
>> (pthubert@cisco.com) wrote:
>>>=20
>>> Hi!
>>>=20
>>>> RPL is designed to operate in very different environment, and some =
LLNs
>> can be very slow, very lossy or even both. This is why RFC 6550 =
refrains from
>> being too specific.
>>>> Maybe it is good enough to add text indicating that the values used =
for DCO
>> are expected to be similar/consistent with those used in DAO?
>>> I agree with Pascal.  In fact, the diversity of environments not =
only makes it
>> very hard to be too specific, but it is one of the reasons the WG has =
produced
>> Applicability Statements for them: not all deployments are the same.
>>>=20
>>> Thanks!
>>>=20
>>> Alvaro.
>>>=20
>>>=20
>=20


From nobody Thu Jul  4 04:37:43 2019
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Subject: [Roll] I-D Action: draft-ietf-roll-unaware-leaves-02.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 Routing Over Low power and Lossy networks WG of the IETF.

        Title           : Routing for RPL Leaves
        Author          : Pascal Thubert
	Filename        : draft-ietf-roll-unaware-leaves-02.txt
	Pages           : 21
	Date            : 2019-07-04

Abstract:
   This specification leverages 6LoWPAN ND to provide a unicast and
   multicast routing service in a RPL domain to 6LNs that do not
   participate to RPL.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-roll-unaware-leaves/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-roll-unaware-leaves-02
https://datatracker.ietf.org/doc/html/draft-ietf-roll-unaware-leaves-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-roll-unaware-leaves-02


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From nobody Thu Jul  4 06:15:28 2019
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Subject: [Roll] I-D Action: draft-ietf-roll-useofrplinfo-31.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 Routing Over Low power and Lossy networks WG of the IETF.

        Title           : Using RPL Option Type, Routing Header for Source Routes and IPv6-in-IPv6 encapsulation in the RPL Data Plane
        Authors         : Maria Ines Robles
                          Michael C. Richardson
                          Pascal Thubert
	Filename        : draft-ietf-roll-useofrplinfo-31.txt
	Pages           : 54
	Date            : 2019-07-04

Abstract:
   This document looks at different data flows through LLN (Low-Power
   and Lossy Networks) where RPL (IPv6 Routing Protocol for Low-Power
   and Lossy Networks) is used to establish routing.  The document
   enumerates the cases where RFC6553 (RPL Option Type), RFC6554
   (Routing Header for Source Routes) and IPv6-in-IPv6 encapsulation is
   required in data plane.  This analysis provides the basis on which to
   design efficient compression of these headers.  This document updates
   RFC6553 adding a change to the RPL Option Type.  Additionally, this
   document updates RFC6550 defining a flag in the DIO Configuration
   Option to indicate about this change and updates RFC8138 as well to
   consider the new Option Type when the RPL Option is decompressed.


The IETF datatracker status page for this draft is:
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From nobody Thu Jul  4 06:17:47 2019
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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Thu, 4 Jul 2019 16:17:30 +0300
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] 6LoRH type in useofRPLinfo
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Dear all,

Version 31 adds more clarification on this item.

Thank you very much Pascal for improving the document.

Best regards,

Ines.

On Tue, Jul 2, 2019 at 5:07 PM Pascal Thubert (pthubert) <pthubert@cisco.co=
m>
wrote:

> Dear all
>
>
>
> Reviewing again
> https://tools.ietf.org/html/draft-ietf-roll-useofrplinfo-25 I think we
> made a mistake in Fig 3:
>
>
>
> The format of RFC 8138 compressed packet is presented as:
>
>
>
>    +--+-----+---+--------------+-----------+-----------+-----------+
>
>    |1 | 0|0 |TSE| 6LoRH Type 6 | Hop Limit | RPI-6LoRH |LOWPAN IPHC|
>
>    +--+-----+---+--------------+-----------+-----------+-----------+
>
>
>
> But it should really be as fig 20 in RFC 8138, meaning the RPI is before
> the IP-in-IP:
>
>
>
>
>
> +-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...
>
>  |11110001|SRH-6LoRH| RPI-  | IP-in-IP | NH=3D1      |11110CPP| UDP | UDP
>
>  |Page 1  |Type1 S=3D2| 6LoRH |  6LoRH   |LOWPAN_IPHC| UDP    | hdr |Payl=
d
>
>  +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-...
>
>             <-8bytes->                  <-        RFC 6282 <https://tools=
.ietf.org/html/rfc6282>      ->
>
>                                                 No RPL artifact
>
>
>
>                Figure 20: Example Compressed Packet with SRH
>
>
>
> Data is removed from the left as consumed. Removing the IP-in-IP removes
> everything left of it including RPI.
>
> What gets forwarded to the unaware leaf starts at the LOWPAN_IPHC.
>
> What=E2=80=99s worth noting is that in Storing Mode the SRH contains the =
address
> of the 6LR that decapsulates.
>
> IOW the SRH encodes the destination of IP-in-IP, whereas the root is the
> source so the encapsulator in the IP-in-IP 6LoRH is elided=E2=80=A6
>
>
>
> All the best,
>
>
>
> Pascal
>
>
>
>
>
>
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll
>

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<div dir=3D"ltr"><div dir=3D"ltr">Dear all,</div><div dir=3D"ltr"><br></div=
><div dir=3D"ltr">Version 31 adds more clarification on this item.<br><div>=
<br></div><div>Thank you very much Pascal for improving the document.</div>=
<div><br></div><div>Best regards,</div><div><br></div><div>Ines.</div></div=
><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tu=
e, Jul 2, 2019 at 5:07 PM Pascal Thubert (pthubert) &lt;<a href=3D"mailto:p=
thubert@cisco.com">pthubert@cisco.com</a>&gt; wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_-2331827722715318091WordSection1">
<p class=3D"MsoNormal">Dear all<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Reviewing again <a href=3D"https://tools.ietf.org/ht=
ml/draft-ietf-roll-useofrplinfo-25" target=3D"_blank">https://tools.ietf.or=
g/html/draft-ietf-roll-useofrplinfo-25</a> I think we made a mistake in Fig=
 3:<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">The format of RFC 8138 compressed packet is presente=
d as:<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0 +--+-----+---+--------------+-----------+------=
-----+-----------+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0 |1 | 0|0 |TSE| 6LoRH Type 6 | Hop Limit | RPI-6=
LoRH |LOWPAN IPHC|<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0 +--+-----+---+--------------+-----------+------=
-----+-----------+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">But it should really be as fig 20 in RFC 8138, meani=
ng the RPI is before the IP-in-IP:<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<pre><u></u>=C2=A0<u></u></pre>
<pre>+-+ ... -+-+ ... +-+- ... -+-+- ... +-+-+-+ ... +-+-+ ... -+ ... +-...=
<u></u><u></u></pre>
<pre> |11110001|SRH-6LoRH| RPI-=C2=A0 | IP-in-IP | NH=3D1=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 |11110CPP| UDP | UDP<u></u><u></u></pre>
<pre> |Page 1=C2=A0 |Type1 S=3D2| 6LoRH |=C2=A0 6LoRH=C2=A0=C2=A0 |LOWPAN_I=
PHC| UDP=C2=A0=C2=A0=C2=A0 | hdr |Payld<u></u><u></u></pre>
<pre> +-+ ... -+-+ ... +-+- ... -+-+-- ... -+-+-+ ... +-+-+ ... -+ ... +-..=
.<u></u><u></u></pre>
<pre>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt=
;-8bytes-&gt;=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 &lt;-=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 <a href=3D"https://tools.ietf.org/html/rfc6282" target=3D"_=
blank">RFC 6282</a>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 -&gt;<u></u><u></u></pre>
<pre>=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=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 No RPL arti=
fact<u></u><u></u></pre>
<pre><u></u>=C2=A0<u></u></pre>
<pre>=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 Figure 20: Example Compressed Packet with SRH<u></u><u></u>=
</pre>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Data is removed from the left as consumed. Removing =
the IP-in-IP removes everything left of it including RPI.<u></u><u></u></p>
<p class=3D"MsoNormal">What gets forwarded to the unaware leaf starts at th=
e LOWPAN_IPHC.
<u></u><u></u></p>
<p class=3D"MsoNormal">What=E2=80=99s worth noting is that in Storing Mode =
the SRH contains the address of the 6LR that decapsulates.<u></u><u></u></p=
>
<p class=3D"MsoNormal">IOW the SRH encodes the destination of IP-in-IP, whe=
reas the root is the source so the encapsulator in the IP-in-IP 6LoRH is el=
ided=E2=80=A6<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">All the best,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Pascal<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>

_______________________________________________<br>
Roll mailing list<br>
<a href=3D"mailto:Roll@ietf.org" target=3D"_blank">Roll@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/roll" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/roll</a><br>
</blockquote></div></div>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>, =?utf-8?B?TWlyamEgS8O8aGxld2luZA==?= <ietf@kuehlewind.net>, Alvaro Retana <aretana.ietf@gmail.com>
Thread-Topic: [Roll] Retrying DCO/DAO, retry parameters
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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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From nobody Fri Jul  5 06:32:46 2019
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From: Mirja Kuehlewind <ietf@kuehlewind.net>
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Date: Fri, 5 Jul 2019 15:32:36 +0200
Cc: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>, Routing Over Low power and Lossy networks <roll@ietf.org>, Alvaro Retana <aretana.ietf@gmail.com>
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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X-List-Received-Date: Fri, 05 Jul 2019 13:32:45 -0000

Hi all,

RFC8085 recommend a maximum sending of one packet per 3 sec (if the RTT =
is unknown). This seems to be also a plausible mininum retry interval =
for your scenarios described below. Can we just add that as a =
requirement (as original proposed in my discuss)?

Also would be okay to define the maximum of 6 retries as a requirement?

Mirja


> On 5. Jul 2019, at 14:48, Pascal Thubert (pthubert) =
<pthubert@cisco.com> wrote:
>=20
> Looks good to me, Rahul
>=20
> All the best,
>=20
> Pascal
>=20
>> -----Original Message-----
>> From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
>> Sent: vendredi 5 juillet 2019 14:30
>> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>; Mirja
>> K=C3=BChlewind <ietf@kuehlewind.net>; Alvaro Retana =
<aretana.ietf@gmail.com>
>> Subject: RE: [Roll] Retrying DCO/DAO, retry parameters
>>=20
>> Can we add something like;
>>=20
>> The DCO retry time should be dependent on the maximum depth of the
>> network and average per hop latency. Thus this could range from 2 sec =
to 120
>> seconds depending on the deployment. The number of retries could be =
set
>> between 2 to 6 depending upon how critical the route invalidation =
could be
>> for the deployment and the link layer retry configuration. For =
networks
>> supporting only MP2P and P2MP flows, such as in AMI and telemetry
>> applications, the 6LRs may not be very keen to invalidate routes, =
unless they
>> are highly memory-constrained. For home and building automation =
networks,
>> with P2P traffic, the 6LRs might be keen to invalidate efficiently =
because it
>> may additionally impact the forwarding efficiency.
>> Note that the DCO might in turn be retried at link layer if link =
layer supports
>> Ack for unicast packets. In such cases where link layer employs =
retry-
>> mechanism for unicast packets, retrying more than 3 times may not be
>> necessary, depending on link layer retry configuration.
>>=20
>> Any thoughts?
>>=20
>> Regards,
>> Rahul
>>=20
>>=20
>> -----Original Message-----
>> From: Roll [mailto:roll-bounces@ietf.org] On Behalf Of Mirja =
Kuehlewind
>> Sent: 04 July 2019 19:28
>> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
>> Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
>>=20
>> I think that is also a good additional to have. I would recommend to =
discus
>> the boundaries in both directions: what the maximum rate I should =
ever to
>> for in order to not permanently overload the network and what are the =
usual
>> considerations to set these parameters correctly for my use case.
>>=20
>> Mirja
>>=20
>>=20
>>> On 4. Jul 2019, at 13:22, Pascal Thubert (pthubert) =
<pthubert@cisco.com>
>> wrote:
>>>=20
>>> You have a point there, Mirja.
>>>=20
>>> UDP over LLNs may have to live with durations that are 1 to 2 orders =
of
>> magnitude longer than usual in more classical links these days. It =
can take a
>> minute and more to get a message through.
>>>=20
>>> So yes, a bit of text that says that the typical latencies and =
turn-around-trip
>> delays observed on the Internet and the default settings that derive =
from that
>> may not apply in LLNs and need to be revisited depending on the link =
type
>> and the number of hops in case of a mesh network.
>>>=20
>>> Is that what you are indicating to us?
>>>=20
>>> Pascal
>>>=20
>>>> -----Original Message-----
>>>> From: Mirja Kuehlewind <ietf@kuehlewind.net>
>>>> Sent: jeudi 4 juillet 2019 13:05
>>>> To: Alvaro Retana <aretana.ietf@gmail.com>; Pascal Thubert =
(pthubert)
>>>> <pthubert@cisco.com>
>>>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
>>>> Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
>>>>=20
>>>> Hi,
>>>>=20
>>>> My request wasn=E2=80=99t to specify this in detail for every =
scenario, it
>>>> was to set boundaries about what's safe to do. The 3 seconds I
>>>> mentions are the recommendation given in RFC8085, however, if you
>>>> have a good reason to use different values that possible but it =
would
>>>> be good to provide more reasoning then about when it is still safe =
to
>>>> use the values and when it should be avoided.
>>>>=20
>>>> Mirja
>>>>=20
>>>>=20
>>>>> On 4. Jul 2019, at 12:44, Alvaro Retana <aretana.ietf@gmail.com> =
wrote:
>>>>>=20
>>>>> On June 27, 2019 at 1:54:11 AM, Pascal Thubert (pthubert)
>>>> (pthubert@cisco.com) wrote:
>>>>>=20
>>>>> Hi!
>>>>>=20
>>>>>> RPL is designed to operate in very different environment, and =
some
>>>>>> LLNs
>>>> can be very slow, very lossy or even both. This is why RFC 6550
>>>> refrains from being too specific.
>>>>>> Maybe it is good enough to add text indicating that the values =
used
>>>>>> for DCO
>>>> are expected to be similar/consistent with those used in DAO?
>>>>> I agree with Pascal.  In fact, the diversity of environments not
>>>>> only makes it
>>>> very hard to be too specific, but it is one of the reasons the WG =
has
>>>> produced Applicability Statements for them: not all deployments are =
the
>> same.
>>>>>=20
>>>>> Thanks!
>>>>>=20
>>>>> Alvaro.
>>>>>=20
>>>>>=20
>>>=20
>>=20
>> _______________________________________________
>> Roll mailing list
>> Roll@ietf.org
>> https://www.ietf.org/mailman/listinfo/roll


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From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
To: Mirja Kuehlewind <ietf@kuehlewind.net>, "Pascal Thubert (pthubert)" <pthubert@cisco.com>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>, Alvaro Retana <aretana.ietf@gmail.com>
Thread-Topic: [Roll] Retrying DCO/DAO, retry parameters
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Date: Sun, 7 Jul 2019 08:29:55 +0000
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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
To: "draft-thubert-roll-turnon-rfc8138@ietf.org" <draft-thubert-roll-turnon-rfc8138@ietf.org>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: [Roll] turnon-8138 review
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Hello Authors,

Following is my review of draft-thubert-roll-turnon-rfc8138-02:

Section 5.4. "Rolling Back", says, the administrator SHOULD make sure that =
all nodes have converged to the "T" flag reset before allowing nodes that d=
o not support the compression in the network.
[RJ] How would a root know that all the nodes have accepted the T-reset? Do=
esn't this require use of capability flag ? Also I'm not sure if the same c=
apability flag used before can be used here?

Section 5.3. "Double Instance Scenario", says that nodes that do not suppor=
t 8138 would either not be configured for the new instance, or would be con=
figured to join it as leaves only.
[RJ] Thus I believe there is some non-RPL management involved to tell the l=
egacy nodes to not join the Instance-with-T-flag.

Section 5.2. "Single Instance Scenario", The root encapsulates packets to t=
he leaves all the way to the parent, which decapsulates and distribute the =
uncompresses inner packet to the leaf.
[RJ] When it says encapsulate/decapsulate, it means IP-in-IP encapsulation/=
decapsulation, right?

Section 4. "Updating RFC 8138"
[RJ] I didn't find any updates to 8138! I believe the text in the section d=
oes not result in 8138 update.

Regards,
Rahul

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<p class=3D"MsoNormal">Hello Authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Following is my review of draft-thubert-roll-turnon-=
rfc8138-02:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 5.4. &#8220;Rolling Back&#8221;, says, the a=
dministrator SHOULD make sure that all nodes have converged to the &#8220;T=
&#8221; flag reset before allowing nodes that do not support the compressio=
n in the network.<o:p></o:p></p>
<p class=3D"MsoNormal">[RJ] How would a root know that all the nodes have a=
ccepted the T-reset? Doesn't this require use of capability flag ? Also I&#=
8217;m not sure if the same capability flag used before can be used here?<o=
:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 5.3. &#8220;Double Instance Scenario&#8221;,=
 says that nodes that do not support 8138 would either not be configured fo=
r the new instance, or would be configured to join it as leaves only.<o:p><=
/o:p></p>
<p class=3D"MsoNormal">[RJ] Thus I believe there is some non-RPL management=
 involved to tell the legacy nodes to not join the Instance-with-T-flag.<o:=
p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 5.2. &#8220;Single Instance Scenario&#8221;,=
 The root encapsulates packets to the leaves all the way to the parent, whi=
ch decapsulates and distribute the uncompresses inner packet to the leaf.<o=
:p></o:p></p>
<p class=3D"MsoNormal">[RJ] When it says encapsulate/decapsulate, it means =
IP-in-IP encapsulation/decapsulation, right?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 4. &#8220;Updating RFC 8138&#8221;<o:p></o:p=
></p>
<p class=3D"MsoNormal">[RJ] I didn't find any updates to 8138! I believe th=
e text in the section does not result in 8138 update.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Rahul<o:p></o:p></p>
</div>
</body>
</html>

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From: "Li Zhao (liz3)" <liz3@cisco.com>
To: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>, "draft-thubert-roll-turnon-rfc8138@ietf.org" <draft-thubert-roll-turnon-rfc8138@ietf.org>
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Subject: Re: [Roll] turnon-8138 review
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From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
To: "Li Zhao (liz3)" <liz3@cisco.com>, "draft-thubert-roll-turnon-rfc8138@ietf.org" <draft-thubert-roll-turnon-rfc8138@ietf.org>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: turnon-8138 review
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Date: Mon, 8 Jul 2019 02:26:14 +0000
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>, "Li Zhao (liz3)" <liz3@cisco.com>, "draft-thubert-roll-turnon-rfc8138@ietf.org" <draft-thubert-roll-turnon-rfc8138@ietf.org>
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>, "draft-thubert-roll-turnon-rfc8138@ietf.org" <draft-thubert-roll-turnon-rfc8138@ietf.org>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] turnon-8138 review
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Dear Rahul and all:

I published 03



Htmlized:       https://datatracker.ietf.org/doc/html/draft-thubert-roll-tu=
rnon-rfc8138

Diff:           https://www.ietf.org/rfcdiff?url2=3Ddraft-thubert-roll-turn=
on-rfc8138-03

To address your comments. Please let me know if I missed something.

All the best,

Pascal

From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
Sent: lundi 8 juillet 2019 02:40
To: draft-thubert-roll-turnon-rfc8138@ietf.org
Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
Subject: turnon-8138 review

Hello Authors,

Following is my review of draft-thubert-roll-turnon-rfc8138-02:

Section 5.4. "Rolling Back", says, the administrator SHOULD make sure that =
all nodes have converged to the "T" flag reset before allowing nodes that d=
o not support the compression in the network.
[RJ] How would a root know that all the nodes have accepted the T-reset? Do=
esn't this require use of capability flag ? Also I'm not sure if the same c=
apability flag used before can be used here?

Section 5.3. "Double Instance Scenario", says that nodes that do not suppor=
t 8138 would either not be configured for the new instance, or would be con=
figured to join it as leaves only.
[RJ] Thus I believe there is some non-RPL management involved to tell the l=
egacy nodes to not join the Instance-with-T-flag.

Section 5.2. "Single Instance Scenario", The root encapsulates packets to t=
he leaves all the way to the parent, which decapsulates and distribute the =
uncompresses inner packet to the leaf.
[RJ] When it says encapsulate/decapsulate, it means IP-in-IP encapsulation/=
decapsulation, right?

Section 4. "Updating RFC 8138"
[RJ] I didn't find any updates to 8138! I believe the text in the section d=
oes not result in 8138 update.

Regards,
Rahul

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<p class=3D"MsoNormal">Dear Rahul and all:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I published 03<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Htmlized:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <a =
href=3D"https://datatracker.ietf.org/doc/html/draft-thubert-roll-turnon-rfc=
8138">
https://datatracker.ietf.org/doc/html/draft-thubert-roll-turnon-rfc8138</a>=
<o:p></o:p></p>
<p class=3D"MsoPlainText">Diff:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; <a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-thube=
rt-roll-turnon-rfc8138-03">
https://www.ietf.org/rfcdiff?url2=3Ddraft-thubert-roll-turnon-rfc8138-03</a=
><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">To address your comments. Please let me know if I mi=
ssed something.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">All the best,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rahul Arvind Jadhav &lt;rahul.jadhav@hu=
awei.com&gt; <br>
<b>Sent:</b> lundi 8 juillet 2019 02:40<br>
<b>To:</b> draft-thubert-roll-turnon-rfc8138@ietf.org<br>
<b>Cc:</b> Routing Over Low power and Lossy networks &lt;roll@ietf.org&gt;<=
br>
<b>Subject:</b> turnon-8138 review<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hello Authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Following is my review of draft-thubert-roll-turnon-=
rfc8138-02:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 5.4. &#8220;Rolling Back&#8221;, says, the a=
dministrator SHOULD make sure that all nodes have converged to the &#8220;T=
&#8221; flag reset before allowing nodes that do not support the compressio=
n in the network.<o:p></o:p></p>
<p class=3D"MsoNormal">[RJ] How would a root know that all the nodes have a=
ccepted the T-reset? Doesn't this require use of capability flag ? Also I&#=
8217;m not sure if the same capability flag used before can be used here?<o=
:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 5.3. &#8220;Double Instance Scenario&#8221;,=
 says that nodes that do not support 8138 would either not be configured fo=
r the new instance, or would be configured to join it as leaves only.<o:p><=
/o:p></p>
<p class=3D"MsoNormal">[RJ] Thus I believe there is some non-RPL management=
 involved to tell the legacy nodes to not join the Instance-with-T-flag.<o:=
p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 5.2. &#8220;Single Instance Scenario&#8221;,=
 The root encapsulates packets to the leaves all the way to the parent, whi=
ch decapsulates and distribute the uncompresses inner packet to the leaf.<o=
:p></o:p></p>
<p class=3D"MsoNormal">[RJ] When it says encapsulate/decapsulate, it means =
IP-in-IP encapsulation/decapsulation, right?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 4. &#8220;Updating RFC 8138&#8221;<o:p></o:p=
></p>
<p class=3D"MsoNormal">[RJ] I didn't find any updates to 8138! I believe th=
e text in the section does not result in 8138 update.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Rahul<o:p></o:p></p>
</div>
</div>
</body>
</html>

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From: Mirja Kuehlewind <ietf@kuehlewind.net>
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To: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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Hi Rahul,

Please see inline.

> On 7. Jul 2019, at 10:29, Rahul Arvind Jadhav =
<rahul.jadhav@huawei.com> wrote:
>=20
> Hi Mirja,
>=20
> Thank you for the ref.
>=20
> I would like to confirm my understanding of RFC 8085 in this context =
(just to check if I am on the same page).
>=20
> Section 3.1.3. "Low Data-Volume Applications" in bullet point 2 states =
that, if the application does not have a way to infer RTT for congestion =
control handling (because there is no return traffic from the =
destination), then it states,
> "Such applications SHOULD NOT send more than one UDP datagram every 3 =
seconds and SHOULD use an even less aggressive rate when possible. =
Shorter values are likely problematic in many cases.=E2=80=9D

Yes, that=E2=80=99s the text I was talking about.

>=20
> My inference from above statement is; use as less aggressive rate as =
possible and whatever the case, cap the sending rate to once per 3 =
second.
> There is no ref on how 3 second rate was arrived at, so could not get =
into more details.

Yes, that is a value that is deemed to be safe as the rate is quite low, =
however, it is well understood that different scenarios have different =
constraints and it is hard to give an ultimate number.

>=20
> In the text that I suggested, the statement, " Thus this could range =
from 2 sec to 120 seconds depending on the deployment" provides a =
max/min rate. Do you think I should add something like?
> "Thus this could range from 2 sec to 120 seconds depending on the =
deployment. In case the latency limits are not known, an implementation =
SHOULD NOT retry DCO more than once in 3 seconds.=E2=80=9D

Yes, that what I was looking for. I think you can even go for "MUST =
NOT=E2=80=9D because this is also restricted to the case where latency =
limits are unknown. If you want, you can cite RFC8085 to given more =
reasoning for the exact value, however, you don=E2=80=99t have to.

Do you think it would also be possible to state a clear requirement for =
the maximum number of retries?

Mirja


>=20
> I like this better.
>=20
> In your earlier mail, there were two questions,=20
> 1. What is the max rate to be used so as not to overload the network?
> 2. What are the usual considerations/reasoning?
> This update and the proposed new para should answer both these =
questions.
>=20
> Kindly let us know your thoughts.
>=20
> Thanks,
> Rahul
>=20
>=20
>=20
> -----Original Message-----
> From: Mirja Kuehlewind [mailto:ietf@kuehlewind.net]=20
> Sent: 05 July 2019 21:33
> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
> Cc: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>; Routing Over Low =
power and Lossy networks <roll@ietf.org>; Alvaro Retana =
<aretana.ietf@gmail.com>
> Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
>=20
> Hi all,
>=20
> RFC8085 recommend a maximum sending of one packet per 3 sec (if the =
RTT is unknown). This seems to be also a plausible mininum retry =
interval for your scenarios described below. Can we just add that as a =
requirement (as original proposed in my discuss)?
>=20
> Also would be okay to define the maximum of 6 retries as a =
requirement?
>=20
> Mirja
>=20
>=20
>> On 5. Jul 2019, at 14:48, Pascal Thubert (pthubert) =
<pthubert@cisco.com> wrote:
>>=20
>> Looks good to me, Rahul
>>=20
>> All the best,
>>=20
>> Pascal
>>=20
>>> -----Original Message-----
>>> From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
>>> Sent: vendredi 5 juillet 2019 14:30
>>> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
>>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>; Mirja=20=

>>> K=C3=BChlewind <ietf@kuehlewind.net>; Alvaro Retana=20
>>> <aretana.ietf@gmail.com>
>>> Subject: RE: [Roll] Retrying DCO/DAO, retry parameters
>>>=20
>>> Can we add something like;
>>>=20
>>> The DCO retry time should be dependent on the maximum depth of the=20=

>>> network and average per hop latency. Thus this could range from 2 =
sec=20
>>> to 120 seconds depending on the deployment. The number of retries=20
>>> could be set between 2 to 6 depending upon how critical the route=20
>>> invalidation could be for the deployment and the link layer retry=20
>>> configuration. For networks supporting only MP2P and P2MP flows, =
such=20
>>> as in AMI and telemetry applications, the 6LRs may not be very keen=20=

>>> to invalidate routes, unless they are highly memory-constrained. For=20=

>>> home and building automation networks, with P2P traffic, the 6LRs=20
>>> might be keen to invalidate efficiently because it may additionally =
impact the forwarding efficiency.
>>> Note that the DCO might in turn be retried at link layer if link=20
>>> layer supports Ack for unicast packets. In such cases where link=20
>>> layer employs retry- mechanism for unicast packets, retrying more=20
>>> than 3 times may not be necessary, depending on link layer retry =
configuration.
>>>=20
>>> Any thoughts?
>>>=20
>>> Regards,
>>> Rahul
>>>=20
>>>=20
>>> -----Original Message-----
>>> From: Roll [mailto:roll-bounces@ietf.org] On Behalf Of Mirja=20
>>> Kuehlewind
>>> Sent: 04 July 2019 19:28
>>> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
>>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
>>> Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
>>>=20
>>> I think that is also a good additional to have. I would recommend to=20=

>>> discus the boundaries in both directions: what the maximum rate I=20
>>> should ever to for in order to not permanently overload the network=20=

>>> and what are the usual considerations to set these parameters =
correctly for my use case.
>>>=20
>>> Mirja
>>>=20
>>>=20
>>>> On 4. Jul 2019, at 13:22, Pascal Thubert (pthubert)=20
>>>> <pthubert@cisco.com>
>>> wrote:
>>>>=20
>>>> You have a point there, Mirja.
>>>>=20
>>>> UDP over LLNs may have to live with durations that are 1 to 2 =
orders=20
>>>> of
>>> magnitude longer than usual in more classical links these days. It=20=

>>> can take a minute and more to get a message through.
>>>>=20
>>>> So yes, a bit of text that says that the typical latencies and=20
>>>> turn-around-trip
>>> delays observed on the Internet and the default settings that derive=20=

>>> from that may not apply in LLNs and need to be revisited depending =
on=20
>>> the link type and the number of hops in case of a mesh network.
>>>>=20
>>>> Is that what you are indicating to us?
>>>>=20
>>>> Pascal
>>>>=20
>>>>> -----Original Message-----
>>>>> From: Mirja Kuehlewind <ietf@kuehlewind.net>
>>>>> Sent: jeudi 4 juillet 2019 13:05
>>>>> To: Alvaro Retana <aretana.ietf@gmail.com>; Pascal Thubert=20
>>>>> (pthubert) <pthubert@cisco.com>
>>>>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
>>>>> Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
>>>>>=20
>>>>> Hi,
>>>>>=20
>>>>> My request wasn=E2=80=99t to specify this in detail for every =
scenario, it=20
>>>>> was to set boundaries about what's safe to do. The 3 seconds I=20
>>>>> mentions are the recommendation given in RFC8085, however, if you=20=

>>>>> have a good reason to use different values that possible but it=20
>>>>> would be good to provide more reasoning then about when it is =
still=20
>>>>> safe to use the values and when it should be avoided.
>>>>>=20
>>>>> Mirja
>>>>>=20
>>>>>=20
>>>>>> On 4. Jul 2019, at 12:44, Alvaro Retana <aretana.ietf@gmail.com> =
wrote:
>>>>>>=20
>>>>>> On June 27, 2019 at 1:54:11 AM, Pascal Thubert (pthubert)
>>>>> (pthubert@cisco.com) wrote:
>>>>>>=20
>>>>>> Hi!
>>>>>>=20
>>>>>>> RPL is designed to operate in very different environment, and=20
>>>>>>> some LLNs
>>>>> can be very slow, very lossy or even both. This is why RFC 6550=20
>>>>> refrains from being too specific.
>>>>>>> Maybe it is good enough to add text indicating that the values=20=

>>>>>>> used for DCO
>>>>> are expected to be similar/consistent with those used in DAO?
>>>>>> I agree with Pascal.  In fact, the diversity of environments not=20=

>>>>>> only makes it
>>>>> very hard to be too specific, but it is one of the reasons the WG=20=

>>>>> has produced Applicability Statements for them: not all =
deployments=20
>>>>> are the
>>> same.
>>>>>>=20
>>>>>> Thanks!
>>>>>>=20
>>>>>> Alvaro.
>>>>>>=20
>>>>>>=20
>>>>=20
>>>=20
>>> _______________________________________________
>>> Roll mailing list
>>> Roll@ietf.org
>>> https://www.ietf.org/mailman/listinfo/roll
>=20


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Subject: [Roll] I-D Action: draft-ietf-roll-nsa-extension-04.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 Routing Over Low power and Lossy networks WG of the IETF.

        Title           : Common Ancestor Objective Functions and Parent Set DAG Metric Container Extension
        Authors         : Remous-Aris Koutsiamanis
                          Georgios Papadopoulos
                          Nicolas Montavont
                          Pascal Thubert
	Filename        : draft-ietf-roll-nsa-extension-04.txt
	Pages           : 15
	Date            : 2019-07-08

Abstract:
   Implementing Packet Replication and Elimination from / to the RPL
   root requires the ability to forward copies of packets over different
   paths via different RPL parents.  Selecting the appropriate parents
   to achieve ultra-low latency and jitter requires information about a
   node's parents.  This document details what information needs to be
   transmitted and how it is encoded within a packet to enable this
   functionality.  This document also describes Objective Functions
   which take advantage of this information to implement multi-path
   routing.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-roll-nsa-extension/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-04
https://datatracker.ietf.org/doc/html/draft-ietf-roll-nsa-extension-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-roll-nsa-extension-04


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: Remous-Aris Koutsiamanis <aris@ariskou.com>
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Cc: "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>,  "Pascal Thubert (pthubert)" <pthubert@cisco.com>, dominique.barthel@orange.com, Diego Dujovne <diego.dujovne@mail.udp.cl>, rahul.jadhav@huawei.com
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--00000000000041b83b058d286523
Content-Type: text/plain; charset="UTF-8"

Hello,

I have just submitted a new version of draft-ietf-roll-nsa-extension
(draft-ietf-roll-nsa-extension-04) which follows the general recommendation
from all the reviewers of our draft: Explicitly specify the OFs to use with
the proposed PS NSA extension.
While there were examples in the previous version of how an OF would
roughly work, in this newer version there is an explicit description.

We wanted to specify OFs which basically work like MRHOF does for the
(normal) preferred parent, but which additionally does alternative parent
selection.
To minimize the extent of the description, we have chosen to "extend" MRHOF
by describing what is done the same and what is changed compared to MRHOF.
We take each section in the description of MRHOF and we describe the
changes or lack thereof.

I'm not sure if this method of extending existing behavior is helpful, so I
would really appreciate some feedback on this.

Kind regards,
Aris

On Mon, Jul 8, 2019 at 11:38 AM <internet-drafts@ietf.org> wrote:

>
> A New Internet-Draft is available from the on-line Internet-Drafts
> directories.
> This draft is a work item of the Routing Over Low power and Lossy networks
> WG of the IETF.
>
>         Title           : Common Ancestor Objective Functions and Parent
> Set DAG Metric Container Extension
>         Authors         : Remous-Aris Koutsiamanis
>                           Georgios Papadopoulos
>                           Nicolas Montavont
>                           Pascal Thubert
>         Filename        : draft-ietf-roll-nsa-extension-04.txt
>         Pages           : 15
>         Date            : 2019-07-08
>
> Abstract:
>    Implementing Packet Replication and Elimination from / to the RPL
>    root requires the ability to forward copies of packets over different
>    paths via different RPL parents.  Selecting the appropriate parents
>    to achieve ultra-low latency and jitter requires information about a
>    node's parents.  This document details what information needs to be
>    transmitted and how it is encoded within a packet to enable this
>    functionality.  This document also describes Objective Functions
>    which take advantage of this information to implement multi-path
>    routing.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-roll-nsa-extension/
>
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-04
> https://datatracker.ietf.org/doc/html/draft-ietf-roll-nsa-extension-04
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-roll-nsa-extension-04
>
>
> 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/
>
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll
>

--00000000000041b83b058d286523
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hello,</div><div><br></div><div>I have just submitted=
 a new version of draft-ietf-roll-nsa-extension (draft-ietf-roll-nsa-extens=
ion-04)
 which follows the general recommendation from all the reviewers of our=20
draft: Explicitly specify the OFs to use with the proposed PS NSA=20
extension.</div><div>While there were examples in the previous version=20
of how an OF would roughly work, in this newer version there is an=20
explicit description.</div><div><br></div><div>We wanted to specify OFs=20
which basically work like MRHOF does for the (normal) preferred parent,=20
but which additionally does alternative parent selection. <br></div><div>To
 minimize the extent of the description, we have chosen to &quot;extend&quo=
t;=20
MRHOF by describing what is done the same and what is changed compared=20
to MRHOF.</div><div>We take each section in the description of MRHOF and we=
 describe the changes or lack thereof.</div><div><br></div><div>I&#39;m not=
 sure if this method of extending existing behavior is helpful, so I would =
really appreciate some feedback on this.</div><div><br></div><div>Kind rega=
rds,</div><div>Aris</div></div><br><div class=3D"gmail_quote"><div dir=3D"l=
tr" class=3D"gmail_attr">On Mon, Jul 8, 2019 at 11:38 AM &lt;<a href=3D"mai=
lto:internet-drafts@ietf.org">internet-drafts@ietf.org</a>&gt; wrote:<br></=
div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bor=
der-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
This draft is a work item of the Routing Over Low power and Lossy networks =
WG of the IETF.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 Common Ancestor Objective Functions and Parent Set DAG Metric Container Ex=
tension<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Authors=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: Remo=
us-Aris Koutsiamanis<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Georgios Papadopoulos<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Nicolas Montavont<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 Pascal Thubert<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Filename=C2=A0 =C2=A0 =C2=A0 =C2=A0 : draft-iet=
f-roll-nsa-extension-04.txt<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Pages=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 15<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Date=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 2019-07-08<br>
<br>
Abstract:<br>
=C2=A0 =C2=A0Implementing Packet Replication and Elimination from / to the =
RPL<br>
=C2=A0 =C2=A0root requires the ability to forward copies of packets over di=
fferent<br>
=C2=A0 =C2=A0paths via different RPL parents.=C2=A0 Selecting the appropria=
te parents<br>
=C2=A0 =C2=A0to achieve ultra-low latency and jitter requires information a=
bout a<br>
=C2=A0 =C2=A0node&#39;s parents.=C2=A0 This document details what informati=
on needs to be<br>
=C2=A0 =C2=A0transmitted and how it is encoded within a packet to enable th=
is<br>
=C2=A0 =C2=A0functionality.=C2=A0 This document also describes Objective Fu=
nctions<br>
=C2=A0 =C2=A0which take advantage of this information to implement multi-pa=
th<br>
=C2=A0 =C2=A0routing.<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-roll-nsa-extension/"=
 rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/doc/draf=
t-ietf-roll-nsa-extension/</a><br>
<br>
There are also htmlized versions available at:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-roll-nsa-extension-04" re=
l=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/draft-ietf-r=
oll-nsa-extension-04</a><br>
<a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-roll-nsa-extens=
ion-04" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf.org/d=
oc/html/draft-ietf-roll-nsa-extension-04</a><br>
<br>
A diff from the previous version is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-roll-nsa-extensio=
n-04" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/rfcdiff?url=
2=3Ddraft-ietf-roll-nsa-extension-04</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/" rel=3D"noreferrer" target=
=3D"_blank">ftp://ftp.ietf.org/internet-drafts/</a><br>
<br>
_______________________________________________<br>
Roll mailing list<br>
<a href=3D"mailto:Roll@ietf.org" target=3D"_blank">Roll@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/roll" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/roll</a><br>
</blockquote></div>

--00000000000041b83b058d286523--


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From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
To: Mirja Kuehlewind <ietf@kuehlewind.net>
CC: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, "Routing Over Low power and Lossy networks" <roll@ietf.org>, Alvaro Retana <aretana.ietf@gmail.com>
Thread-Topic: [Roll] Retrying DCO/DAO, retry parameters
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Date: Mon, 8 Jul 2019 10:29:56 +0000
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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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Date: Mon, 8 Jul 2019 14:08:35 +0200
Cc: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, Routing Over Low power and Lossy networks <roll@ietf.org>, Alvaro Retana <aretana.ietf@gmail.com>
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To: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
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Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
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Thanks a lot! I will clear my discuss if a new version is posted.

Mirja


> On 8. Jul 2019, at 12:29, Rahul Arvind Jadhav =
<rahul.jadhav@huawei.com> wrote:
>=20
> Thanks Mirja,
>=20
> I'll change the text to following:
>=20
> "Thus this could range from 2 sec to 120 seconds depending on the =
deployment. In case the latency limits are not known, an implementation =
MUST NOT retry more than once in 3 seconds and MUST NOT retry more than =
3 times."
>=20
> I don't think there is any reason to retry more than thrice anyways, =
so it should be safe to put these limits.
> I will add the above text to the document and provide an update =
(unless anyone else comments).
>=20
> Thanks,
> Rahul
>=20
>=20
>=20
>>=20
>> In the text that I suggested, the statement, " Thus this could range =
from 2 sec to 120 seconds depending on the deployment" provides a =
max/min rate. Do you think I should add something like?
>> "Thus this could range from 2 sec to 120 seconds depending on the =
deployment. In case the latency limits are not known, an implementation =
SHOULD NOT retry DCO more than once in 3 seconds.=E2=80=9D
>=20
> Yes, that what I was looking for. I think you can even go for "MUST =
NOT=E2=80=9D because this is also restricted to the case where latency =
limits are unknown. If you want, you can cite RFC8085 to given more =
reasoning for the exact value, however, you don=E2=80=99t have to.
>=20
> Do you think it would also be possible to state a clear requirement =
for the maximum number of retries?
>=20
> Mirja
>=20
>=20
>>=20
>> I like this better.
>>=20
>> In your earlier mail, there were two questions, 1. What is the max=20
>> rate to be used so as not to overload the network?
>> 2. What are the usual considerations/reasoning?
>> This update and the proposed new para should answer both these =
questions.
>>=20
>> Kindly let us know your thoughts.
>>=20
>> Thanks,
>> Rahul
>>=20
>>=20
>>=20
>> -----Original Message-----
>> From: Mirja Kuehlewind [mailto:ietf@kuehlewind.net]
>> Sent: 05 July 2019 21:33
>> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
>> Cc: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>; Routing Over Low=20=

>> power and Lossy networks <roll@ietf.org>; Alvaro Retana=20
>> <aretana.ietf@gmail.com>
>> Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
>>=20
>> Hi all,
>>=20
>> RFC8085 recommend a maximum sending of one packet per 3 sec (if the =
RTT is unknown). This seems to be also a plausible mininum retry =
interval for your scenarios described below. Can we just add that as a =
requirement (as original proposed in my discuss)?
>>=20
>> Also would be okay to define the maximum of 6 retries as a =
requirement?
>>=20
>> Mirja
>>=20
>>=20
>>> On 5. Jul 2019, at 14:48, Pascal Thubert (pthubert) =
<pthubert@cisco.com> wrote:
>>>=20
>>> Looks good to me, Rahul
>>>=20
>>> All the best,
>>>=20
>>> Pascal
>>>=20
>>>> -----Original Message-----
>>>> From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
>>>> Sent: vendredi 5 juillet 2019 14:30
>>>> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
>>>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>; =
Mirja=20
>>>> K=C3=BChlewind <ietf@kuehlewind.net>; Alvaro Retana=20
>>>> <aretana.ietf@gmail.com>
>>>> Subject: RE: [Roll] Retrying DCO/DAO, retry parameters
>>>>=20
>>>> Can we add something like;
>>>>=20
>>>> The DCO retry time should be dependent on the maximum depth of the=20=

>>>> network and average per hop latency. Thus this could range from 2=20=

>>>> sec to 120 seconds depending on the deployment. The number of=20
>>>> retries could be set between 2 to 6 depending upon how critical the=20=

>>>> route invalidation could be for the deployment and the link layer=20=

>>>> retry configuration. For networks supporting only MP2P and P2MP=20
>>>> flows, such as in AMI and telemetry applications, the 6LRs may not=20=

>>>> be very keen to invalidate routes, unless they are highly=20
>>>> memory-constrained. For home and building automation networks, with=20=

>>>> P2P traffic, the 6LRs might be keen to invalidate efficiently =
because it may additionally impact the forwarding efficiency.
>>>> Note that the DCO might in turn be retried at link layer if link=20
>>>> layer supports Ack for unicast packets. In such cases where link=20
>>>> layer employs retry- mechanism for unicast packets, retrying more=20=

>>>> than 3 times may not be necessary, depending on link layer retry =
configuration.
>>>>=20
>>>> Any thoughts?
>>>>=20
>>>> Regards,
>>>> Rahul
>>>>=20
>>>>=20
>>>> -----Original Message-----
>>>> From: Roll [mailto:roll-bounces@ietf.org] On Behalf Of Mirja=20
>>>> Kuehlewind
>>>> Sent: 04 July 2019 19:28
>>>> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
>>>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
>>>> Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
>>>>=20
>>>> I think that is also a good additional to have. I would recommend =
to=20
>>>> discus the boundaries in both directions: what the maximum rate I=20=

>>>> should ever to for in order to not permanently overload the network=20=

>>>> and what are the usual considerations to set these parameters =
correctly for my use case.
>>>>=20
>>>> Mirja
>>>>=20
>>>>=20
>>>>> On 4. Jul 2019, at 13:22, Pascal Thubert (pthubert)=20
>>>>> <pthubert@cisco.com>
>>>> wrote:
>>>>>=20
>>>>> You have a point there, Mirja.
>>>>>=20
>>>>> UDP over LLNs may have to live with durations that are 1 to 2=20
>>>>> orders of
>>>> magnitude longer than usual in more classical links these days. It=20=

>>>> can take a minute and more to get a message through.
>>>>>=20
>>>>> So yes, a bit of text that says that the typical latencies and=20
>>>>> turn-around-trip
>>>> delays observed on the Internet and the default settings that =
derive=20
>>>> from that may not apply in LLNs and need to be revisited depending=20=

>>>> on the link type and the number of hops in case of a mesh network.
>>>>>=20
>>>>> Is that what you are indicating to us?
>>>>>=20
>>>>> Pascal
>>>>>=20
>>>>>> -----Original Message-----
>>>>>> From: Mirja Kuehlewind <ietf@kuehlewind.net>
>>>>>> Sent: jeudi 4 juillet 2019 13:05
>>>>>> To: Alvaro Retana <aretana.ietf@gmail.com>; Pascal Thubert
>>>>>> (pthubert) <pthubert@cisco.com>
>>>>>> Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
>>>>>> Subject: Re: [Roll] Retrying DCO/DAO, retry parameters
>>>>>>=20
>>>>>> Hi,
>>>>>>=20
>>>>>> My request wasn=E2=80=99t to specify this in detail for every =
scenario, it=20
>>>>>> was to set boundaries about what's safe to do. The 3 seconds I=20
>>>>>> mentions are the recommendation given in RFC8085, however, if you=20=

>>>>>> have a good reason to use different values that possible but it=20=

>>>>>> would be good to provide more reasoning then about when it is=20
>>>>>> still safe to use the values and when it should be avoided.
>>>>>>=20
>>>>>> Mirja
>>>>>>=20
>>>>>>=20
>>>>>>> On 4. Jul 2019, at 12:44, Alvaro Retana <aretana.ietf@gmail.com> =
wrote:
>>>>>>>=20
>>>>>>> On June 27, 2019 at 1:54:11 AM, Pascal Thubert (pthubert)
>>>>>> (pthubert@cisco.com) wrote:
>>>>>>>=20
>>>>>>> Hi!
>>>>>>>=20
>>>>>>>> RPL is designed to operate in very different environment, and=20=

>>>>>>>> some LLNs
>>>>>> can be very slow, very lossy or even both. This is why RFC 6550=20=

>>>>>> refrains from being too specific.
>>>>>>>> Maybe it is good enough to add text indicating that the values=20=

>>>>>>>> used for DCO
>>>>>> are expected to be similar/consistent with those used in DAO?
>>>>>>> I agree with Pascal.  In fact, the diversity of environments not=20=

>>>>>>> only makes it
>>>>>> very hard to be too specific, but it is one of the reasons the WG=20=

>>>>>> has produced Applicability Statements for them: not all=20
>>>>>> deployments are the
>>>> same.
>>>>>>>=20
>>>>>>> Thanks!
>>>>>>>=20
>>>>>>> Alvaro.
>>>>>>>=20
>>>>>>>=20
>>>>>=20
>>>>=20
>>>> _______________________________________________
>>>> Roll mailing list
>>>> Roll@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/roll
>>=20
>=20


From nobody Mon Jul  8 05:58:00 2019
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Subject: [Roll] I-D Action: draft-ietf-roll-efficient-npdao-15.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 Routing Over Low power and Lossy networks WG of the IETF.

        Title           : Efficient Route Invalidation
        Authors         : Rahul Arvind Jadhav
                          Pascal Thubert
                          Rabi Narayan Sahoo
                          Zhen Cao
	Filename        : draft-ietf-roll-efficient-npdao-15.txt
	Pages           : 23
	Date            : 2019-07-08

Abstract:
   This document explains the problems associated with the current use
   of NPDAO messaging and also discusses the requirements for an
   optimized route invalidation messaging scheme.  Further a new
   proactive route invalidation message called as "Destination Cleanup
   Object" (DCO) is specified which fulfills requirements of an
   optimized route invalidation messaging.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-roll-efficient-npdao/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-roll-efficient-npdao-15
https://datatracker.ietf.org/doc/html/draft-ietf-roll-efficient-npdao-15

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-roll-efficient-npdao-15


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: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Li Zhao (liz3)" <liz3@cisco.com>, "draft-ietf-roll-unaware-leaves@ietf.org" <draft-ietf-roll-unaware-leaves@ietf.org>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>
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From: "Li Zhao (liz3)" <liz3@cisco.com>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, "draft-ietf-roll-unaware-leaves@ietf.org" <draft-ietf-roll-unaware-leaves@ietf.org>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: multicast in unaware-leaves
Thread-Index: AQHVNjNXlfxFW3XNtU+NsE/nsIg/8abCDQ3AgAGCq4A=
Date: Wed, 10 Jul 2019 01:48:00 +0000
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Subject: Re: [Roll] multicast in unaware-leaves
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Li Zhao (liz3)" <liz3@cisco.com>
CC: "draft-ietf-roll-unaware-leaves@ietf.org" <draft-ietf-roll-unaware-leaves@ietf.org>, "Routing Over Low power and Lossy networks" <roll@ietf.org>
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Subject: Re: [Roll] multicast in unaware-leaves
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Date: Wed, 10 Jul 2019 22:41:55 +0300
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Subject: [Roll] Agenda IETF 105 - Request for slides
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Dear all,

Please find below the proposed agenda for the IETF 105

https://datatracker.ietf.org/meeting/105/materials/agenda-105-roll-00

Dear Presenters, please send your slides in pdf before July 19

Comments welcome,

Thank you,

Ines and Peter

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<div dir=3D"ltr">Dear all,<br><br>Please find below the proposed agenda for=
 the IETF 105<br><br><a href=3D"https://datatracker.ietf.org/meeting/105/ma=
terials/agenda-105-roll-00">https://datatracker.ietf.org/meeting/105/materi=
als/agenda-105-roll-00</a><div><br>Dear Presenters, please send your slides=
 in pdf before July 19</div><div><br>Comments welcome,</div><div><br>Thank =
you,</div><div><br>Ines and Peter<br></div></div>

--000000000000520614058d58df30--


From nobody Thu Jul 11 14:29:43 2019
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Subject: [Roll] Protocol Action: 'Using RPL Option Type, Routing Header for Source Routes and IPv6-in-IPv6 encapsulation in the RPL Data Plane' to Proposed Standard (draft-ietf-roll-useofrplinfo-31.txt)
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The IESG has approved the following document:
- 'Using RPL Option Type, Routing Header for Source Routes and IPv6-in-
   IPv6 encapsulation in the RPL Data Plane'
  (draft-ietf-roll-useofrplinfo-31.txt) as Proposed Standard

This document is the product of the Routing Over Low power and Lossy networks
Working Group.

The IESG contact persons are Alvaro Retana, Martin Vigoureux and Deborah
Brungard.

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





Technical Summary

   This document provides a series of examples that align RFC6553 
   with the recent changes in processing described in RFC8200. In other 
   words, the examples are intended to be normative explanation of the 
   results of executing that language. 
   Existing deployed networks may experience a flag day as a result of 
   some of the suggested changes, and this document provides a way 
   to mitigate such an occurrence.

Working Group Summary

   There was clear consensus in the ROLL WG that this document was 
   needed.  The extensive subject, involving many details, has led to 
   lengthy discussions about terminology, and coverage of all cases.

Document Quality

   The document is of special value to the the 6tisch WG.
   There are no known implementations by manufacturers, but 
   comments have been incorporated from people who needed to 
   address a subset of the  cases discussed in the document.
   The drafts ietf-anima-bootstrapping-keyinfra and 
   ietf-6tisch-dtsecurity-secure-join rely on the cases discussed 
   in this document.

Personnel

   Document Shepherd is Peter van der Stok
   Responsible Area Director is Alvaro Retana


From nobody Thu Jul 11 14:32:09 2019
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Subject: [Roll] Protocol Action: 'Efficient Route Invalidation' to Proposed Standard (draft-ietf-roll-efficient-npdao-15.txt)
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The IESG has approved the following document:
- 'Efficient Route Invalidation'
  (draft-ietf-roll-efficient-npdao-15.txt) as Proposed Standard

This document is the product of the Routing Over Low power and Lossy networks
Working Group.

The IESG contact persons are Alvaro Retana, Martin Vigoureux and Deborah
Brungard.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-roll-efficient-npdao/





Technical Summary

   This document describes the problems associated with No-Path
   Destination Advertisement Object (NPDAO) messaging used in Routing
   Protocol for Low power and lossy networks (RPL) for route
   invalidation and signaling changes to improve route invalidation
   efficiency.

Working Group Summary

   The WG process moved along without issues.

Document Quality

   A pilot is implemented for a smart meter based solution which is 
   deployed with Huawei's Enterprise Access Router (AR-series). 

Personnel

   Document Shepherd is Peter van der Stok.
   Responsible Area Director is Alvaro Retana.


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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Sun, 14 Jul 2019 17:20:01 +0300
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Subject: [Roll] Minute Taker - Jabber Scriber for IETF 105
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Dear all,

Please let us know if you could kindly be the Minute Taker or the Jabber
Scribe for the IETF 105.

Really appreciated :-)

Thank you,

Ines and Peter.

--00000000000089f928058da4d714
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<div dir=3D"ltr">Dear all,<br><div><br></div><div>Please let us know if you=
 could kindly be the Minute Taker or the Jabber Scribe for the IETF 105.</d=
iv><div><br></div><div>Really appreciated :-)</div><div><br></div><div>Than=
k you,</div><div><br></div><div>Ines and Peter.</div></div>

--00000000000089f928058da4d714--


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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Tue, 16 Jul 2019 23:12:00 +0300
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Subject: Re: [Roll] Agenda IETF 105 - Request for slides
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--000000000000f3c110058dd1fd14
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Dear all,

Please find an updated version of the agenda

https://datatracker.ietf.org/meeting/105/materials/agenda-105-roll-01.txt

Dear Presenters, kindly send your slides in pdf before July 19 - you can
upload the set of slides (please in pdf) keeping the deadline date.

----------------- Material Addition to
Presenters-------------------------------
Shortly after IETF 104, it is added the ability for presenters to upload
slides and suggesting to the chairs that they be added to a session.

On the meeting materials page for the group
https://datatracker.ietf.org/meeting/105/session/roll anyone logged
in who is not a chair/secretary for the group gets a [Suggest New Slides]
button.

When they upload slides using that, the chairs will get email, and the
suggestions will appear in a new block on that page.

Chairs can then accept or reject each suggestion.
------------------------------------------------------------------------------------------

Thank you,

Comments welcome,

Ines and Peter.

On Wed, Jul 10, 2019 at 10:41 PM Ines Robles <mariainesrobles@googlemail.com>
wrote:

> Dear all,
>
> Please find below the proposed agenda for the IETF 105
>
> https://datatracker.ietf.org/meeting/105/materials/agenda-105-roll-00
>
> Dear Presenters, please send your slides in pdf before July 19
>
> Comments welcome,
>
> Thank you,
>
> Ines and Peter
>

--000000000000f3c110058dd1fd14
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<div dir=3D"ltr">Dear all,<div><br></div><div>Please find an updated versio=
n of the agenda</div><div><br></div><div><a href=3D"https://datatracker.iet=
f.org/meeting/105/materials/agenda-105-roll-01.txt" target=3D"_blank">https=
://datatracker.ietf.org/meeting/105/materials/agenda-105-roll-01.txt</a><br=
></div><div><br></div><div>Dear Presenters, kindly send your slides in pdf =
before July 19 - you can upload the set of slides (please in pdf) keeping t=
he deadline date.=C2=A0<br></div><div><br></div><div>----------------- Mate=
rial Addition to Presenters-------------------------------</div><div>Shortl=
y after IETF 104, it is added the ability for presenters to upload=C2=A0<br=
>slides and suggesting to the chairs that they be added to a session.<br><b=
r>On the meeting materials page for the group=C2=A0<a href=3D"https://datat=
racker.ietf.org/meeting/105/session/roll">https://datatracker.ietf.org/meet=
ing/105/session/roll</a> anyone logged=C2=A0</div><div>in who is not a chai=
r/secretary for the group gets a [Suggest New=C2=A0Slides] button.<br><br>W=
hen they upload slides using that, the chairs will get email, and the=C2=A0=
<br>suggestions will appear in a new block on that page.<br><br>Chairs can =
then accept or reject each suggestion.</div><div>--------------------------=
----------------------------------------------------------------</div><div>=
<br></div><div>Thank you,</div><div><br></div><div>Comments welcome,</div><=
div><br></div><div>Ines and Peter.</div></div><br><div class=3D"gmail_quote=
"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Jul 10, 2019 at 10:41 PM In=
es  Robles &lt;<a href=3D"mailto:mariainesrobles@googlemail.com" target=3D"=
_blank">mariainesrobles@googlemail.com</a>&gt; wrote:<br></div><blockquote =
class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px sol=
id rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Dear all,<br><br>Ple=
ase find below the proposed agenda for the IETF 105<br><br><a href=3D"https=
://datatracker.ietf.org/meeting/105/materials/agenda-105-roll-00" target=3D=
"_blank">https://datatracker.ietf.org/meeting/105/materials/agenda-105-roll=
-00</a><div><br>Dear Presenters, please send your slides in pdf before July=
 19</div><div><br>Comments welcome,</div><div><br>Thank you,</div><div><br>=
Ines and Peter<br></div></div>
</blockquote></div>

--000000000000f3c110058dd1fd14--


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Date: Sun, 21 Jul 2019 20:36:47 +0300
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Subject: [Roll] Looking for Document Shepherd
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--0000000000000b4381058e346867
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Dear all,

The following documents need a Document Shepherd:

- draft-ietf-roll-dao-projection
- draft-ietf-roll-nsa-extension
- draft-ietf-roll-unaware-leaves

Please indicate if you volunteer to be the Shepherd of one of these
documents.

Guide:
- https://tools.ietf.org/html/rfc4858
- https://www.ietf.org/blog/iesg-statement-document-shepherds/
-
https://trac.ietf.org/trac/rtg/raw-attachment/wiki/WGChairTraining/rtgwg_train_8.pdf

Thank you very much in advance,

Ines and Peter

--0000000000000b4381058e346867
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<div dir=3D"ltr">Dear all,<br><div><br></div><div>The following documents n=
eed a=C2=A0<span style=3D"color:rgb(0,0,0);font-size:13.3333px">Document Sh=
epherd</span>:=C2=A0<br></div><div><br></div><div>- draft-ietf-roll-dao-pro=
jection</div><div>-=C2=A0draft-ietf-roll-nsa-extension</div><div>-=C2=A0dra=
ft-ietf-roll-unaware-leaves</div><div><br></div><div>Please indicate if you=
 volunteer to be the Shepherd of one of these documents.</div><div><br></di=
v><div>Guide:=C2=A0</div><div>- <a href=3D"https://tools.ietf.org/html/rfc4=
858">https://tools.ietf.org/html/rfc4858</a></div><div>-=C2=A0<a href=3D"ht=
tps://www.ietf.org/blog/iesg-statement-document-shepherds/">https://www.iet=
f.org/blog/iesg-statement-document-shepherds/</a></div><div>-=C2=A0<a href=
=3D"https://trac.ietf.org/trac/rtg/raw-attachment/wiki/WGChairTraining/rtgw=
g_train_8.pdf">https://trac.ietf.org/trac/rtg/raw-attachment/wiki/WGChairTr=
aining/rtgwg_train_8.pdf</a></div><div><br></div><div>Thank you very much i=
n advance,</div><div><br></div><div>Ines and Peter</div><div><br></div><div=
><br></div><div><br></div><div><br></div><div><br></div><div><br></div><div=
><br></div></div>

--0000000000000b4381058e346867--


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Dear authors and Roll,

Below is my review for draft-ietf-roll-dis-modifications-00.

In overall, I find the document very interesting and necessary to :
* to avoid reseting the Tirckle timer on each DIS message, may lead to =
energy saving and avoiding the potential congestion in the network.
* minimize the number of DIO responses on each DIS request, may help to =
avoid the congestion and collisions in the network.

Bellow is the draft contents with my annotations, starting with =
=E2=80=9C[GP]=E2=80=9D.

Cheers,
Georgios

=E2=80=94 =E2=80=94 =E2=80=94=20





Internet Engineering Task Force                         C. Gundogan, Ed.
Internet-Draft                                               HAW Hamburg
Intended status: Standards Track                              D. Barthel
Expires: September 14, 2017                                       Orange
                                                             E. Baccelli
                                                                   INRIA
                                                          March 13, 2017


                           DIS Modifications
                  draft-ietf-roll-dis-modifications-00

Abstract

   This document augments [RFC6550] with DIS flags and options that
   allow a RPL node to better control how neighbor RPL routers respond
   to its solicitation for DIOs.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 14, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of




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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  RFC6550 refresher . . . . . . . . . . . . . . . . . . . .   2
     1.2.  Undesirable effects . . . . . . . . . . . . . . . . . . .   3
     1.3.  Desired improvments . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  DIS Base Object flags . . . . . . . . . . . . . . . . . . . .   5
   4.  DIS Options . . . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Metric Container  . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Response Spreading  . . . . . . . . . . . . . . . . . . .   6
     4.3.  DIO Option Request  . . . . . . . . . . . . . . . . . . .   7
   5.  Full behavior illustration  . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  DIS Flags . . . . . . . . . . . . . . . . . . . . . . . .   9
     6.2.  RPL Control Message Options . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Appendix A.  Applications . . . . . . . . . . . . . . . . . . . .  11
     A.1.  A Leaf Node Joining a DAG . . . . . . . . . . . . . . . .  11
     A.2.  Identifying A Defunct DAG . . . . . . . . . . . . . . . .  12
     A.3.  Explicit and Implicit DIO Option Requests . . . . . . . .  14
   Appendix B.  Experimental data  . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   This document augments [RFC6550], the RPL routing protocol
   specification.

1.1.  RFC6550 refresher

   Per [RFC6550], a RPL node can send a DODAG Information Solicitation
   (DIS) message to solicit DODAG Information Object (DIO) messages from
   neighbor RPL routers.

   A DIS can be multicast to all the routers in range or it can be
   unicast to a specific neighbor router.

   A DIS may carry a Solicited Information option that specifies the
   predicates of the DAG(s) the soliciting node is interested in.  In
   the absence of such Solicited Information option, the soliciting node



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   is deemed interested in receiving DIOs for all the DAGs known by the
   solicited router(s).

   [RFC6550] requires a router to treat the receipt of a multicast DIS
   as an inconsistency and hence reset its Trickle timers for the
   matching DAGs.  As a result of the general Trickle timer mechanism,
   future DIOs will be sent at a higher rate.  See [RFC6206] for the
   specification of Trickle timers and the definition of
   "inconsistency".

   [RFC6550] requires a router that receives a unicast DIS to respond by
   unicasting a DIO for each matching DAG and to not reset the
   associated Trickle timer.  Such a DIO generated in response to a
   unicast DIS must contain a Configuration option.

   This description is summarized in Table 1.

   +----------------------------+----------------------+---------------+
   |                            |     Unicast DIS      | Multicast DIS |
   +----------------------------+----------------------+---------------+
   |     no option present      |  unicast DIO, don't  |    do reset   |
   |                            | reset Trickle timer  | Trickle timer |
   | -------------------------- | -------------------- | ------------- |
   |   Solicited Information    |      do nothing      |   do nothing  |
   |    option present, not     |                      |               |
   |          matching          |                      |               |
   | -------------------------- | -------------------- | ------------- |
   |   Solicited Information    |  unicast DIO, don't  |    do reset   |
   |  option present, matching  | reset Trickle timer  | Trickle timer |
   +----------------------------+----------------------+---------------+

        Table 1: Router behavior on receiving a DIS, as per RFC6550

[GP] In Multicast DIS column, there is no response action like in =
Unicast DIS column.
When a multicast DIS is received, the node will send back a DIO?

[GP] don=E2=80=99t =E2=80=94> do not

   More precisely, Table 1 describes the behavior of routers for each
   DAG they belong to.  In the general case where multiple RPL instances
   co-exist in a network, routers will maintain a Trickle timer for the
   one DAG of each RPL instance they belong to, and nodes may send a DIS
   with multiple Solicited Information options pertaining to different
   DAGs or instances.  In this more general case, routers will respond
   for each individual DAG/instance they belong to as per Table 1.

1.2.  Undesirable effects

   Now, consider a RPL leaf node that desires to join a certain DAG.
   This node can either wait for its neighbor RPL routers to voluntarily
   transmit DIOs or it can proactively solicit DIOs using a DIS message.

[GP] voluntarily?? Isn=E2=80=99t it based on the Trickle timer?=20
If I am not mistaken, each device transmits a DIO depending on the =
Trickle timer.

   Voluntary DIO transmissions may happen after a very long time if the
   network is stable and the Trickle timer intervals have reached large



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   values.  Thus, proactively seeking DIOs using a DIS may be the only
   reasonable option.  Since the node does not know which neighbor
   routers belong to the DAG, it must solicit the DIOs using a multicast
   DIS (with predicates of the desired DAG specified inside a Solicited
   Information option).  On receiving this DIS, the neighbor routers
   that belong to the desired DAG will reset their Trickle timers and
   quickly transmit their DIOs.  The downside of resetting Trickle
   timers is that the routers will keep transmitting frequent DIOs for a
   considerable duration until the Trickle timers again reach long
   intervals.  These DIO transmissions are unnecessary, consume precious
   energy and may contribute to congestion in the network.

   There are other scenarios where resetting of Trickle timer following
   the receipt of a multicast DIS is not appropriate.  For example,
   consider a RPL router that desires to free up memory by deleting
   state for the defunct DAGs it belongs to.  Identifying a defunct DAG
   may require the node to solicit DIOs from its DAG parents using a
   multicast DIS.

   Certain scenarios may require a RPL router to solicit a DIO from a
   parent by using a unicast DIS.  The parent is forced to include a
   Configuration option within the unicast DIO, although the requesting
   node might still have this information locally available.  Since the
   information within the Configuration option is described as generally
   static and unchanging throughout the DODAG, it inflates the unicast
   DIO unnecessarily by 16 bytes for each request.

1.3.  Desired improvments

   To deal with the situations described above, there is a need in the
   industry for DIS flags and options that allow a RPL node to control
   how neighbor RPL routers respond to its solicitation for DIOs, for
   example by expressing:

   o  the routing constraints that routers should meet to be allowed to
      respond, thereby lowering the number of responders

   o  whether the responding routers should reset their Trickle timers
      or not, thereby limiting the cumulated number of transmitted DIOs

   o  whether the responding routers should respond with a unicast DIO
      instead of a multicast one, thereby lowering the overhearing cost
      in the network

   o  whether the responding routers should omit DIO options that were
      not requested explicitely and thus reducing the amount of traffic
      and giving full control over the options of the solicited DIO




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   o  the time interval over which the responding routers should
      schedule their DIO transmissions, thereby lowering the occurence
      of collisions.

2.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   [RFC2119].

   Additionally, this document uses terminology from [RFC6550].
   Specifically, the term RPL node refers to a RPL router or a RPL host
   as defined in [RFC6550].

3.  DIS Base Object flags

   This document defines three new flags inside the DIS base object:

[GP] maybe having the original DIS message format Figure would help to =
follow the bullet points below.

   o  the "No Inconsistency" (N) flag: On receiving a multicast DIS with
      the N flag set, a RPL router MUST NOT reset the Trickle timers for
      the matching DAGs.  In addition, it MUST take specific action,
      which is to respond by explicitely sending a DIO.  This DIO MUST
      include a Configuration option.  This behavior augments [RFC6550],
      which had provision for such flag.  Since this specific, one-shot
      DIO is not a consequence of the general Trickle timer mechanism,
      it will be sent right away if no Response Spreading option is
      present or it will be scheduled according to the Response
      Spreading option if one is present in the DIS (see Section 4.2).

   o  the "DIO Type" (T) flag: In case the N flag is set, this T flag
      specifies what type of DIO is sent in response.  It MUST be a
      unicast DIO if this flag is set and it MUST be a multicast DIO if
      this flag is reset.

[GP] In this second sentence of this paragraph, please specify which =
flag is =E2=80=9Cthis flag=E2=80=9D, the T or N?

   o  the "DIO Option Request" (R) flag: On receiving a DIS with the R
      flag set, the receiver MUST include all options that were
      requested by the DIS containing one or multiple DIO Option Request
      options.  A responding RPL router MUST NOT include DIO options
      that were not explicitely requested.  Note that this behaviour
      contradicts with [RFC6550] for the case of including a
      Configuration option in all DIOs requested by a unicast DIS.

   When a unicast DIS is transmitted, both its N and T flags SHOULD be
   0, which are the default values per [RFC6550].  On receiving a
   unicast DIS, the N and T flags MUST be ignored and treated as 00.
   When the R flag is unset, then a RPL router may include or omit DIO
   options like specified in [RFC6550].  A rpl router responding to a

[GP] rpl =E2=80=94> RPL



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   DIS with the R flag set MUST only include all requested DIO options
   in the solicited DIO.

   The modified DIS base object is shown in Figure 1.

       0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |N|T|R|  Flags  |    Reserved   | Option(s)...
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+


                    Figure 1: Modified DIS Base Object

[GP] In 6550 defines any bits or all are available?

4.  DIS Options

4.1.  Metric Container

   In order to lower the number of routers that will respond to a DIS,
   this document allows routing constraints to be carried by a DIS.
   Only the router(s) that satisfy these constraints is (are) allowed to
   respond to the DIS.

   These routing constraints are described using a Metric Container
   option contained in the DIS.  Metric Containers are defined in
   [RFC6550] and [RFC6551].  Metric Containers options were previously
   only allowed in DIOs.  This document augments [RFC6550] by allowing
   the inclusion of a Metric Container option inside a DIS as well.

   A RPL router that receives a DIS with a Metric Container option MUST
   ignore any Metric object in it, and MUST evaluate the "mandatory"
   Constraint objects in it by comparing the constraint value to the
   value of the corresponding routing metric that the router maintains
   for the matching DAG(s).  These routing metric values MUST satisfy
   all the mandatory constraints in order for the router to consider the
   solicitation successful for the matching DAG(s).  This augments the
   behavior already present in [RFC6550] with the Solicited Information
   option.

   This option can be used in both unicast and multicast DIS.

4.2.  Response Spreading









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             0                   1                   2
             0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
            |  Type =3D 0x0B  |    Length     | Spread. Inter.|
            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                  Figure 2: The Response Spreading option

   Even with the use of the Solicited Information and the Section 4.1
   options, a multicast DIS may still lead to a large number of RPL
   routers taking immediate action and responding with DIOs.  Concurrent
   transmissions by multiple routers are not desirable since they may
   lead to poor channel utilization or even to packet loss.  Unicast
   DIOs may be able to avail of link-level retransmissions.  However,
   multicast DIOs usually have no such protection, since they commonly
   make use of link layer broadcast.  To avoid such problems, this
   document specifies an optional DIO response spreading mechanism.

   This document defines a new RPL control message option called
   Response Spreading option, shown in Figure 2, with a recommended Type
   value 0x0B (to be confirmed by IANA).  A RPL router that explicitely
   responds with a specific, one-shot DIO to a DIS that includes a
   Response Spreading option, MUST wait for a time uniformly chosen in
   the interval [O..2^SpreadingInterval], expressed in ms, before
   attempting to transmit its DIO.  If the DIS does not include a
   Response Spreading option, the node is free to transmit the DIO as it
   otherwise would.

[GP] if you could further elaborate this paragraph.
The =E2=80=9CMUST wait for a time uniformly chosen=E2=80=9D is not clear =
the concept of randomness here.

   A Response Spreading option MAY be included inside a unicast DIS
   message, but there is no benefit in doing so.

   Multiple Response Spreading options SHOULD NOT be used inside a same
   DIS message.

   This mechanism MUST NOT affect the Trickle timer mechanism.

4.3.  DIO Option Request

             0                   1                   2
             0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
            |  Type =3D 0x0C  |    Length     | Req. Opt. Type|
            +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                  Figure 3: The DIO Option Request option

   If a unicast DIS is used to request a DIO, then [RFC6550] mandates
   that a Configuration option MUST be included in this DIO.  The



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   Configuration option contains generally static information that stays
   unmodified throughout the DAG.  For scenarios where a RPL node is
   already part of a DAG and hence is holding the information that is
   propagated with the Configuration option, an inclusion of such leads
   to an unnecesary inflation of 16 bytes for each solicited DIO.

   As per [RFC6550], no process is defined to trigger the inclusion of
   other DIO options in a solicited DIO.

   This document defines a new RPL control message option called DIO
   Option Request option, shown in Figure 3, with a recommended Type
   value of 0x0C (to be confirmed by IANA).  This new option allows full
   control over the options of the solicited DIO.  The target of a
   unicast or multicast DIS with the R flag set and with one or more DIO
   Option Request options included, MUST include these requested options
   in the solicited DIO.  For a DIS with the R flag unset, a RPL router
   behaves like described in [RFC6550] with regard to DIO options.

5.  Full behavior illustration

   Figure 4 and Figure 5 illustrate the normative behavior described in
   Section 3 and Section 4.1.

                            +--------------------+----------------------
                            |    Unicast DIS     |         Multicast DIS
                            +--------------------+--------------------+-
                            |                    |         N=3D0        =
|
       +--------------------+--------------------+--------------------+-
       |                    | unicast DIO,       |                    |
       | no option present  | don't              | do                 |
       |                    | reset Trickle timer| reset Trickle timer|
       +--------------------+--------------------+--------------------+-
       | Solicited Informa- |                    |                    |
       | tion/Metric Contai-| do nothing         | do nothing         |
       | ner option present,|                    |                    |
       | not matching.      |                    |                    |
       +--------------------+--------------------+--------------------+-
       | Solicited Informa- | unicast DIO,       |                    |
       | tion/Metric Contai-| don't              | do                 |
       | ner option present,| reset Trickle timer| reset Trickle timer|
       | matching.          |                    |                    |
       +--------------------+--------------------+--------------------+-

                  Figure 4: Overall DIS behavior, part 1

[GP] the don=E2=80=99t =E2=80=94> do not

   Notice that Figure 4 is indeed identical to Table 1 when Metric
   Container options are not used in DIS.




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         -------------------------------------------+
          Multicast DIS                             |
         ----------------------+--------------------+
          |      N=3D1, T=3D0      |      N=3D1, T=3D1      |
         -+--------------------+--------------------+
          | multicast DIO,     | unicast DIO,       |
          | don't              | don't              |
          | reset Trickle timer| reset Trickle timer|
         -+--------------------+--------------------+
          |                    |                    |
          | do nothing         | do nothing         |
          |                    |                    |
          |                    |                    |
         -+--------------------+--------------------+
          | multicast DIO,     | unicast DIO,       |
          | don't              | don't              |
          | reset Trickle timer| reset Trickle timer|
          |                    |                    |
         -+--------------------+--------------------+

                  Figure 5: Overall DIS behavior, part 2

[GP] the don=E2=80=99t =E2=80=94> do not

   For the sake of completeness, let's remind here that a specific, one-
   shot DIO generated in response to a DIS with the R flag unset MUST
   contain a Configuration option.  If the R flag is set, then this DIO
   contains only explicitely requested DIO options.  This DIO's
   transmission is delayed according to the Delay Spreading option of
   the DIS, if one such option is present.

6.  IANA Considerations

6.1.  DIS Flags

   IANA is requested to allocate bits 0, 1 and 2 of the DIS Flag Field
   to become the "No Inconsistency", "DIO Type", and "DIO Option
   Request" bits, the functionality of which is described in Section 3
   of this document.

              +-------+--------------------+---------------+
              | Value |      Meaning       |   Reference   |
              +-------+--------------------+---------------+
              |   0   |  No Inconsistency  | This document |
              |   1   |      DIO Type      | This document |
              |   2   | DIO Option Request | This document |
              +-------+--------------------+---------------+






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6.2.  RPL Control Message Options

   IANA is requested to allocate a new code point in the "RPL Control
   Message Options" registry for the "Response Spreading" option and the
   "Dio Option Request" option, the behavior of which are described in
   Section 4.2 and Section 4.3, respectively.

[GP] Dio =E2=80=94> DIO

              +-------+--------------------+---------------+
              | Value |      Meaning       |   Reference   |
              +-------+--------------------+---------------+
              |  0x0B | Response Spreading | This document |
              |  0x0C | DIO Option Request | This document |
              +-------+--------------------+---------------+

                        RPL Control Message Options

7.  Security Considerations

   TBA

8.  Acknowledgements

   A lot of text in this document originates from now-expired [I-
   D.goyal-roll-dis-modifications] co-authored with M.  Goyal.  The
   requirements and solutions also draw from now-expired [I-D.dejean-
   roll-selective-dis] co-authored with N.  Dejean.  Their contribution
   is deeply acknowledged.

   We also thank (TBA) for their useful feedback and discussion.

9.  References

9.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <http://www.rfc-editor.org/info/rfc2119>.

   [RFC6550]  Winter, T., Ed., Thubert, P., Ed., Brandt, A., Hui, J.,
              Kelsey, R., Levis, P., Pister, K., Struik, R., Vasseur,
              JP., and R. Alexander, "RPL: IPv6 Routing Protocol for
              Low-Power and Lossy Networks", RFC 6550,
              DOI 10.17487/RFC6550, March 2012,
              <http://www.rfc-editor.org/info/rfc6550>.






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   [RFC6551]  Vasseur, JP., Ed., Kim, M., Ed., Pister, K., Dejean, N.,
              and D. Barthel, "Routing Metrics Used for Path Calculation
              in Low-Power and Lossy Networks", RFC 6551,
              DOI 10.17487/RFC6551, March 2012,
              <http://www.rfc-editor.org/info/rfc6551>.

9.2.  Informative References

   [RFC4861]  Narten, T., Nordmark, E., Simpson, W., and H. Soliman,
              "Neighbor Discovery for IP version 6 (IPv6)", RFC 4861,
              DOI 10.17487/RFC4861, September 2007,
              <http://www.rfc-editor.org/info/rfc4861>.

   [RFC5184]  Teraoka, F., Gogo, K., Mitsuya, K., Shibui, R., and K.
              Mitani, "Unified Layer 2 (L2) Abstractions for Layer 3
              (L3)-Driven Fast Handover", RFC 5184,
              DOI 10.17487/RFC5184, May 2008,
              <http://www.rfc-editor.org/info/rfc5184>.

   [RFC5881]  Katz, D. and D. Ward, "Bidirectional Forwarding Detection
              (BFD) for IPv4 and IPv6 (Single Hop)", RFC 5881,
              DOI 10.17487/RFC5881, June 2010,
              <http://www.rfc-editor.org/info/rfc5881>.

   [RFC6206]  Levis, P., Clausen, T., Hui, J., Gnawali, O., and J. Ko,
              "The Trickle Algorithm", RFC 6206, DOI 10.17487/RFC6206,
              March 2011, <http://www.rfc-editor.org/info/rfc6206>.

Appendix A.  Applications

   This section details two example mechanisms that use the DIS flags
   and options defined in this document.  The first mechanism describes
   how a leaf node may join a desired DAG in an energy efficient manner.
   The second mechanism details how a node may identify defunct DAGs for
   which it still maintains state.

A.1.  A Leaf Node Joining a DAG

   A new leaf node that joins an established LLN runs an iterative
   algorithm in which it requests (using multicast DIS) DIOs from
   routers belonging to the desired DAG.

   The DIS message has the "No Inconsistency" flag set to prevent
   resetting of Trickle timer in responding routers, thereby keeping the
   aggregated number of transmissions low.  It also has the "DIO Type"
   flag set to make responding routers send unicast DIOs back, thereby
   not triggering full reception in nearby nodes that have state-of-the-
   art radio receivers with hardware-based address filtering.



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   The DIS message can include a Response Spreading option prescribing a
   suitable spreading interval based on the expected density of nearby
   routers and on the expected Layer 2 technology.

   The DIS will likely include a Metric Container listing the routing
   constraints that the responding routers must satisfy in order to be
   allowed to respond.

   At each iteration, the node multicasts such a DIS and waits for
   forthcoming DIOs.  After a time equal to the spreading interval, the
   node considers the current iteration to be unsuccessful.  The node
   consequently relaxes the routing constraints somewhat and proceeds to
   the next iteration.

   The cycle repeats until the node receives one or more DIOs or until
   it has relaxed the constraints to the lowest acceptable values.

   This algorithm has been proven in the field to be extremely energy-
   efficient, especially when routers have a wide communication range.

A.2.  Identifying A Defunct DAG

   A RPL node may remove a neighbor from its parent set for a DAG for a
   number of reasons:

   o  The neighbor is no longer reachable, as determined using a
      mechanism such as Neighbor Unreachanility Detection (NUD)
      [RFC4861], Bidirectional Forwarding Detection (BFD) [RFC5881] or
      L2 triggers [RFC5184]; or

   o  The neighbor advertises an infinite rank in the DAG; or

   o  Keeping the neighbor as a parent would required the node to
      increase its rank beyond L + DAGMaxRankIncrease, where L is the
      minimum rank the node has had in this DAG; or

   o  The neighbor advertises membership in a different DAG within the
      same RPL Instance, where a different DAG is recognised by a
      different DODAGID or a different DODAGVersionNumber.

   Even if the conditions listed above exist, a RPL node may fail to
   remove a neighbor from its parent set because:

   o  The node may fail to receive the neighbor's DIOs advertising an
      increased rank or the neighbor's membership in a different DAG;

   o  The node may not check, and hence may not detect, the neighbor's
      unreachability for a long time.  For example, the node may not



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      have any data to send to this neighbor and hence may not encounter
      any event (such as failure to send data to this neighbor) that
      would trigger a check for the neighbor's reachability.

   In such cases, a node would continue to consider itself attached to a
   DAG even if all its parents in the DAG are unreachable or have moved
   to different DAGs.  Such a DAG can be characterized as being defunct
   from the node's perspective.  If the node maintains state about a
   large number of defunct DAGs, such state may prevent a considerable
   portion of the total memory in the node from being available for more
   useful purposes.

   To alleviate the problem described above, a RPL node may invoke the
   following procedure to identify a defunct DAG and delete the state it
   maintains for this DAG.  Note that, given the proactive nature of RPL
   protocol, the lack of data traffic using a DAG can not be considered
   a reliable indication of the DAG's defunction.  Further, the Trickle
   timer based control of DIO transmissions means the possibility of an
   indefinite delay in the receipt of a new DIO from a functional DAG
   parent.  Hence, the mechanism described here is based on the use of a
   DIS message to solicit DIOs about a DAG suspected of defunction.
   Further, a multicast DIS is used so as to avoid the need to query
   each parent individually and also to discover other neighbor routers
   that may serve as the node's new parents in the DAG.

   When a RPL node has not received a DIO from any of its parents in a
   DAG for more than a locally configured time duration:

   o  The node generates a multicast DIS message with:

      *  the "No Inconsistency" flag set so that the responding routers
         do not reset their Trickle timers.

      *  the "DIO Type" flag not set so that the responding routers send
         multicast DIOs and other nodes in the vicinity do not need to
         invoke this procedure.

      *  a Solicited Information option to identify the DAG in question.
         This option must have the I and D flags set and the
         RPLInstanceID/DODAGID fields must be set to values identifying
         the DAG.  The V flag inside the Solicited Information option
         should not be set so as to allow the neighbors to send DIOs
         advertising the latest version of the DAG.

      *  a Response Spreading option specifying a suitable time interval
         over which the DIO responses may arrive.





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   o  After sending the DIS, the node waits for the duration specified
      inside the Response Spreading option to receive the DIOs generated
      by its neighbors.  At the conclusion of the wait duration:

      *  If the node has received one or more DIOs advertising newer
         version(s) of the DAG, it joins the latest version of the DAG,
         selects a new parent set among the neighbors advertising the
         latest DAG version and marks the DAG status as functional.

      *  Otherwise, if the node has not received a DIO advertising the
         current version of the DAG from a neighbor in the parent set,
         it removes that neighbor from the parent set.  As a result, if
         the node has no parent left in the DAG, it marks the DAG as
         defunct and schedule the deletion of the state it has
         maintained for the DAG after a locally configured "hold"
         duration.  (This is because, as per RPL specification, when a
         node no longer has any parents left in a DAG, it is still
         required to remember the DAG's identity (RPLInstanceID,
         DODAGID, DODAGVersionNumber), the lowest rank (L) it has had in
         this DAG and the DAGMaxRankIncrease value for the DAG for a
         certain time interval to ensure that the node does not join an
         earlier version of the DAG and does not rejoin the current
         version of the DAG at a rank higher than L +
         DAGMaxRankIncrease.)

A.3.  Explicit and Implicit DIO Option Requests

   Certain information from a DIO is only needed occasionally or for
   specific events:

   o  A Configuration option contains information that is static and
      stays mostly unchanged during the lifetime of the DODAG.  Thus,
      the Configuration option is important when joining the DODAG, but
      inflates the DIO unnecessarily thereafter.

   o  A Prefix Information option is also useful when joining a DODAG to
      perform address autoconfiguration and propagating the prefixes.
      After that, it is only relevant when changes occure that would
      affect the prefix information (new prefixes, lifetime updates,
      ...).

   o  More DIO options may be added in the future that have similar
      properties as mentioned above.

   The Configuration and Prefix Information options may be omitted from
   the trickle timer based DIOs, leading to less bytes for each DIO.
   Once a RPL router decides to join a DODAG, it may solicit a DIO by
   sending a DIS with the R flag set and two "DIO Option Request"



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   options included.  One for the Configuration option, the other for
   the Prefix Information option.  Upon receiving these options in the
   next DIO, the RPL router can successfully finish the joining process.

Appendix B.  Experimental data

   The effectiveness of these flags and options has been measured on
   real industrial hardware.

   Data to be added

Authors' Addresses

   Cenk Gundogan (editor)
   HAW Hamburg

   Email: cenk.guendogan@haw-hamburg.de


   Dominique Barthel
   Orange
   28 Chemin Du Vieux Chene, BP 98
   Meylan  38243
   France

   Email: dominique.barthel@orange.com


   Emmanuel Baccelli
   INRIA

   Phone: +33-169-335-511
   Email: Emmanuel.Baccelli@inria.fr
   URI:   http://www.emmanuelbaccelli.org/

















Gundogan, et al.       Expires September 14, 2017              [Page 15]



____________________________________

Georgios Z. Papadopoulos, Ph.D.
Associate Professor, IMT Atlantique, Rennes

web: 	 www.georgiospapadopoulos.com =
<http://www.georgiospapadopoulos.com/>
twitter: 	@gzpapadopoulos =
<https://twitter.com/gzpapadopoulos?ref_src=3Dtwsrc%5Etfw&ref_url=3Dhttp:/=
/georgiospapadopoulos.com/>
tel:		+33 (0)2 99 12 70 04
____________________________________


--Apple-Mail=_28D6F31E-1A0A-4E88-9FAD-9472F1109231
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Dear authors and Roll,<div class=3D""><br class=3D""></div><div=
 class=3D"">Below is my review =
for&nbsp;draft-ietf-roll-dis-modifications-00.</div><div class=3D""><br =
class=3D""></div><div class=3D"">In overall, I find the document very =
interesting and necessary to :</div><div class=3D"">* to avoid reseting =
the Tirckle timer on each DIS message, may lead to energy saving and =
avoiding the potential congestion in the network.</div><div class=3D"">* =
minimize the number of DIO responses on each DIS request, may help to =
avoid the congestion and collisions in the network.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Bellow is the draft =
contents with my annotations, starting with =E2=80=9C[GP]=E2=80=9D.<br =
class=3D""></div><div class=3D""><br class=3D""></div><div =
class=3D"">Cheers,<br class=3D"">Georgios</div><div class=3D""><br =
class=3D"">=E2=80=94 =E2=80=94 =E2=80=94&nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D""><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet Engineering Task Force &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; C. Gundogan, =
Ed.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Internet-Draft &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; HAW Hamburg</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Intended status: Standards =
Track&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D. Barthel</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Expires: September 14, 2017 &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Orange</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&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; E. Baccelli</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&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; =
INRIA</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&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; March 13, 2017</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
DIS Modifications</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Abstract</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; This document =
augments [RFC6550] with DIS flags and options that</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; allow a RPL node to better control how neighbor =
RPL routers respond</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; to its solicitation =
for DIOs.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">Status =
of This Memo</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; This Internet-Draft is submitted in full =
conformance with the</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
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style=3D"margin: 0px; line-height: normal; font-family: Courier; =
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initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 1]</span></div><p style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
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0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; the Trust Legal =
Provisions and are provided without warranty as</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; described in the Simplified BSD =
License.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">Table =
of Contents</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; 1.&nbsp; Introduction&nbsp; . . . . . . . . . . =
. . . . . . . . . . . . . . &nbsp; 2</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; &nbsp; 1.1.&nbsp; RFC6550 refresher . . . . . . =
. . . . . . . . . . . . . . &nbsp; 2</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; &nbsp; 1.2.&nbsp; Undesirable effects . . . . . =
. . . . . . . . . . . . . . &nbsp; 3</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; &nbsp; 1.3.&nbsp; Desired improvments . . . . . =
. . . . . . . . . . . . . . &nbsp; 4</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; 2.&nbsp; Terminology . . . . . . . . . . . . . . =
. . . . . . . . . . . &nbsp; 5</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; 3.&nbsp; DIS Base =
Object flags . . . . . . . . . . . . . . . . . . . . &nbsp; =
5</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; 4.&nbsp; DIS =
Options . . . . . . . . . . . . . . . . . . . . . . . . . &nbsp; =
6</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; 4.1.&nbsp; =
Metric Container&nbsp; . . . . . . . . . . . . . . . . . . . . &nbsp; =
6</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; 4.2.&nbsp; =
Response Spreading&nbsp; . . . . . . . . . . . . . . . . . . . &nbsp; =
6</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; 4.3.&nbsp; =
DIO Option Request&nbsp; . . . . . . . . . . . . . . . . . . . &nbsp; =
7</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; 5.&nbsp; Full =
behavior illustration&nbsp; . . . . . . . . . . . . . . . . . &nbsp; =
8</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; 6.&nbsp; IANA =
Considerations . . . . . . . . . . . . . . . . . . . . . &nbsp; =
9</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; 6.1.&nbsp; =
DIS Flags . . . . . . . . . . . . . . . . . . . . . . . . &nbsp; =
9</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; 6.2.&nbsp; =
RPL Control Message Options . . . . . . . . . . . . . . .&nbsp; =
10</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; 7.&nbsp; Security =
Considerations . . . . . . . . . . . . . . . . . . .&nbsp; =
10</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; 8.&nbsp; =
Acknowledgements&nbsp; . . . . . . . . . . . . . . . . . . . . . .&nbsp; =
10</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; 9.&nbsp; =
References&nbsp; . . . . . . . . . . . . . . . . . . . . . . . . .&nbsp; =
10</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; 9.1.&nbsp; =
Normative References&nbsp; . . . . . . . . . . . . . . . . . .&nbsp; =
10</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; 9.2.&nbsp; =
Informative References&nbsp; . . . . . . . . . . . . . . . . .&nbsp; =
11</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Appendix A.&nbsp; =
Applications . . . . . . . . . . . . . . . . . . . .&nbsp; =
11</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; A.1.&nbsp; A =
Leaf Node Joining a DAG . . . . . . . . . . . . . . . .&nbsp; =
11</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; A.2.&nbsp; =
Identifying A Defunct DAG . . . . . . . . . . . . . . . .&nbsp; =
12</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; A.3.&nbsp; =
Explicit and Implicit DIO Option Requests . . . . . . . .&nbsp; =
14</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Appendix B.&nbsp; =
Experimental data&nbsp; . . . . . . . . . . . . . . . . .&nbsp; =
15</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Authors' =
Addresses&nbsp; . . . . . . . . . . . . . . . . . . . . . . .&nbsp; =
15</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">1.&nbsp; Introduction</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; This document =
augments [RFC6550], the RPL routing protocol</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; specification.</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">1.1.&nbsp; RFC6550 =
refresher</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Per [RFC6550], a RPL node can send a DODAG =
Information Solicitation</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; (DIS) message to =
solicit DODAG Information Object (DIO) messages from</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; neighbor RPL routers.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; A DIS can be =
multicast to all the routers in range or it can be</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; unicast to a specific neighbor =
router.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; A DIS may carry a Solicited Information option =
that specifies the</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; predicates of the =
DAG(s) the soliciting node is interested in.&nbsp; In</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; the absence of such Solicited Information =
option, the soliciting node</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 2]</span></div><p style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; is deemed =
interested in receiving DIOs for all the DAGs known by =
the</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; solicited =
router(s).</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; [RFC6550] requires a router to treat the receipt =
of a multicast DIS</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; as an inconsistency =
and hence reset its Trickle timers for the</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; matching DAGs.&nbsp; As a result of the general =
Trickle timer mechanism,</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; future DIOs will be =
sent at a higher rate.&nbsp; See [RFC6206] for the</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; specification of Trickle timers and the =
definition of</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; =
"inconsistency".</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; [RFC6550] requires a router that receives a =
unicast DIS to respond by</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; unicasting a DIO =
for each matching DAG and to not reset the</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; associated Trickle timer.&nbsp; Such a DIO =
generated in response to a</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; unicast DIS must =
contain a Configuration option.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; This description is =
summarized in Table 1.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; =
+----------------------------+----------------------+---------------+</spa=
n></div><div style=3D"margin: 0px; line-height: normal; font-family: =
Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; |&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | &nbsp; &nbsp; Unicast DIS&nbsp; &nbsp; &nbsp; | =
Multicast DIS |</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; =
+----------------------------+----------------------+---------------+</spa=
n></div><div style=3D"margin: 0px; line-height: normal; font-family: =
Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; | &nbsp; &nbsp; no =
option present&nbsp; &nbsp; &nbsp; |&nbsp; unicast DIO, don't&nbsp; =
|&nbsp; &nbsp; do reset &nbsp; |</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; |&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; | reset Trickle timer&nbsp; | Trickle timer =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; | =
-------------------------- | -------------------- | ------------- =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; | &nbsp; Solicited =
Information&nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; do nothing&nbsp; &nbsp; =
&nbsp; | &nbsp; do nothing&nbsp; |</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; |&nbsp; &nbsp; option present, not &nbsp; &nbsp; =
|&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; | &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; |&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; matching&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; | -------------------------- | =
-------------------- | ------------- |</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; | &nbsp; Solicited Information&nbsp; &nbsp; =
|&nbsp; unicast DIO, don't&nbsp; |&nbsp; &nbsp; do reset &nbsp; =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; |&nbsp; option =
present, matching&nbsp; | reset Trickle timer&nbsp; | Trickle timer =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; =
+----------------------------+----------------------+---------------+</spa=
n></div><div style=3D"margin: 0px; line-height: normal; font-family: =
Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; Table 1: Router behavior on receiving a DIS, as per =
RFC6550</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">[GP] =
In Multicast DIS column, there is no response action like in Unicast DIS =
column.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">When a multicast DIS is =
received, the node will send back a DIO?</span></div><div style=3D"margin:=
 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">[GP] don=E2=80=99t =E2=80=94&gt; =
do not</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; More precisely, Table 1 describes the behavior =
of routers for each</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; DAG they belong =
to.&nbsp; In the general case where multiple RPL =
instances</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; co-exist in a =
network, routers will maintain a Trickle timer for the</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; one DAG of each RPL instance they belong to, and =
nodes may send a DIS</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; with multiple =
Solicited Information options pertaining to different</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; DAGs or instances.&nbsp; In this more general =
case, routers will respond</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; for each individual =
DAG/instance they belong to as per Table 1.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">1.2.&nbsp; Undesirable =
effects</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Now, consider a RPL leaf node that desires to =
join a certain DAG.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; This node can =
either wait for its neighbor RPL routers to voluntarily</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; transmit DIOs or it can proactively solicit DIOs =
using a DIS message.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">[GP] =
voluntarily?? Isn=E2=80=99t it based on the Trickle =
timer?&nbsp;</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">If I am not mistaken, each =
device transmits a DIO depending on the Trickle timer.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Voluntary DIO =
transmissions may happen after a very long time if the</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; network is stable and the Trickle timer =
intervals have reached large</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 3]</span></div><p style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; values.&nbsp; Thus, =
proactively seeking DIOs using a DIS may be the only</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; reasonable option.&nbsp; Since the node does not =
know which neighbor</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; routers belong to =
the DAG, it must solicit the DIOs using a multicast</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; DIS (with predicates of the desired DAG =
specified inside a Solicited</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Information =
option).&nbsp; On receiving this DIS, the neighbor =
routers</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; that belong to the =
desired DAG will reset their Trickle timers and</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; quickly transmit their DIOs.&nbsp; The downside =
of resetting Trickle</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; timers is that the =
routers will keep transmitting frequent DIOs for a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; considerable duration until the Trickle timers =
again reach long</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; intervals.&nbsp; =
These DIO transmissions are unnecessary, consume =
precious</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; energy and may =
contribute to congestion in the network.</span></div><div style=3D"margin:=
 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; There are other =
scenarios where resetting of Trickle timer following</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; the receipt of a multicast DIS is not =
appropriate.&nbsp; For example,</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; consider a RPL =
router that desires to free up memory by deleting</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; state for the defunct DAGs it belongs to.&nbsp; =
Identifying a defunct DAG</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; may require the =
node to solicit DIOs from its DAG parents using a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; multicast DIS.</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Certain scenarios =
may require a RPL router to solicit a DIO from a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; parent by using a unicast DIS.&nbsp; The parent =
is forced to include a</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Configuration =
option within the unicast DIO, although the requesting</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; node might still have this information locally =
available.&nbsp; Since the</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; information within =
the Configuration option is described as generally</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; static and unchanging throughout the DODAG, it =
inflates the unicast</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; DIO unnecessarily =
by 16 bytes for each request.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">1.3.&nbsp; Desired =
improvments</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; To deal with the situations described above, =
there is a need in the</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; industry for DIS =
flags and options that allow a RPL node to control</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; how neighbor RPL routers respond to its =
solicitation for DIOs, for</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; example by =
expressing:</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; o&nbsp; the routing constraints that routers =
should meet to be allowed to</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; respond, =
thereby lowering the number of responders</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; whether the =
responding routers should reset their Trickle timers</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; or not, thereby limiting the cumulated number of =
transmitted DIOs</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; o&nbsp; whether the responding routers should =
respond with a unicast DIO</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; instead of =
a multicast one, thereby lowering the overhearing cost</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; in the network</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; whether the =
responding routers should omit DIO options that were</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; not requested explicitely and thus reducing the amount of =
traffic</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; and giving =
full control over the options of the solicited DIO</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 4]</span></div><p style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; the time =
interval over which the responding routers should</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; schedule their DIO transmissions, thereby lowering the =
occurence</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; of =
collisions.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">2.&nbsp; Terminology</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; The key words =
"MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT =
RECOMMENDED", "MAY", and</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; "OPTIONAL" in this =
document are to be interpreted as described in</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; [RFC2119].</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Additionally, this =
document uses terminology from [RFC6550].</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Specifically, the term RPL node refers to a RPL =
router or a RPL host</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; as defined in =
[RFC6550].</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">3.&nbsp; DIS Base Object flags</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; This document =
defines three new flags inside the DIS base object:</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">[GP] maybe having the original =
DIS message format Figure would help to follow the bullet points =
below.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; o&nbsp; the "No Inconsistency" (N) flag: On =
receiving a multicast DIS with</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; the N flag =
set, a RPL router MUST NOT reset the Trickle timers for</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; the matching DAGs.&nbsp; In addition, it MUST take =
specific action,</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; which is to =
respond by explicitely sending a DIO.&nbsp; This DIO =
MUST</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; include a =
Configuration option.&nbsp; This behavior augments =
[RFC6550],</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; which had =
provision for such flag.&nbsp; Since this specific, =
one-shot</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; DIO is not =
a consequence of the general Trickle timer mechanism,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; it will be sent right away if no Response Spreading option =
is</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; present or =
it will be scheduled according to the Response</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; Spreading option if one is present in the DIS (see Section =
4.2).</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; o&nbsp; the "DIO Type" (T) flag: In case the N =
flag is set, this T flag</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; specifies =
what type of DIO is sent in response.&nbsp; It MUST be =
a</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; unicast DIO =
if this flag is set and it MUST be a multicast DIO if</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; this flag is reset.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">[GP] In this second sentence of =
this paragraph, please specify which flag is =E2=80=9Cthis flag=E2=80=9D, =
the T or N?</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; o&nbsp; the "DIO Option Request" (R) flag: On =
receiving a DIS with the R</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; flag set, =
the receiver MUST include all options that were</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; requested by the DIS containing one or multiple DIO Option =
Request</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; =
options.&nbsp; A responding RPL router MUST NOT include DIO =
options</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; that were =
not explicitely requested.&nbsp; Note that this =
behaviour</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; contradicts =
with [RFC6550] for the case of including a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; Configuration option in all DIOs requested by a unicast =
DIS.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; When a unicast DIS is transmitted, both its N =
and T flags SHOULD be</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; 0, which are the =
default values per [RFC6550].&nbsp; On receiving a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; unicast DIS, the N and T flags MUST be ignored =
and treated as 00.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; When the R flag is =
unset, then a RPL router may include or omit DIO</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; options like specified in [RFC6550].&nbsp; A rpl =
router responding to a</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">[GP] rpl =E2=80=94&gt; =
RPL</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 5]</span></div><p style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; DIS with the R flag =
set MUST only include all requested DIO options</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; in the solicited DIO.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; The modified DIS =
base object is shown in Figure 1.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; 0 =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1 &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2 &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 3</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 =
6 7 8 9 0 1</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></=
div><div style=3D"margin: 0px; line-height: normal; font-family: =
Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
|N|T|R|&nbsp; Flags&nbsp; |&nbsp; &nbsp; Reserved &nbsp; | =
Option(s)...</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></=
div><div style=3D"margin: 0px; line-height: normal; font-family: =
Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Figure 1: Modified DIS Base =
Object</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">[GP] =
In 6550 defines any bits or all are available?</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">4.&nbsp; DIS =
Options</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">4.1.&nbsp; Metric Container</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; In order to lower =
the number of routers that will respond to a DIS,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; this document allows routing constraints to be =
carried by a DIS.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Only the router(s) =
that satisfy these constraints is (are) allowed to</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; respond to the DIS.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; These routing =
constraints are described using a Metric Container</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; option contained in the DIS.&nbsp; Metric =
Containers are defined in</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; [RFC6550] and =
[RFC6551].&nbsp; Metric Containers options were =
previously</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; only allowed in =
DIOs.&nbsp; This document augments [RFC6550] by =
allowing</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; the inclusion of a =
Metric Container option inside a DIS as well.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; A RPL router that =
receives a DIS with a Metric Container option MUST</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; ignore any Metric object in it, and MUST =
evaluate the "mandatory"</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Constraint objects =
in it by comparing the constraint value to the</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; value of the corresponding routing metric that =
the router maintains</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; for the matching =
DAG(s).&nbsp; These routing metric values MUST satisfy</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; all the mandatory constraints in order for the =
router to consider the</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; solicitation =
successful for the matching DAG(s).&nbsp; This augments =
the</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; behavior already =
present in [RFC6550] with the Solicited Information</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; option.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; This option can be =
used in both unicast and multicast DIS.</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">4.2.&nbsp; Response =
Spreading</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 6]</span></div><p style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; 0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; 1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; 2</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 =
3</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; =
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; Type =3D 0x0B&nbsp; |&nbsp; =
&nbsp; Length &nbsp; &nbsp; | Spread. Inter.|</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Figure 2: The Response Spreading =
option</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Even with the use of the Solicited Information =
and the Section 4.1</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; options, a =
multicast DIS may still lead to a large number of RPL</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; routers taking immediate action and responding =
with DIOs.&nbsp; Concurrent</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; transmissions by =
multiple routers are not desirable since they may</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; lead to poor channel utilization or even to =
packet loss.&nbsp; Unicast</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; DIOs may be able to =
avail of link-level retransmissions.&nbsp; However,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; multicast DIOs usually have no such protection, =
since they commonly</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; make use of link =
layer broadcast.&nbsp; To avoid such problems, this</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; document specifies an optional DIO response =
spreading mechanism.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; This document defines a new RPL control message =
option called</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Response Spreading =
option, shown in Figure 2, with a recommended Type</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; value 0x0B (to be confirmed by IANA).&nbsp; A =
RPL router that explicitely</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; responds with a =
specific, one-shot DIO to a DIS that includes a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Response Spreading option, MUST wait for a time =
uniformly chosen in</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; the interval =
[O..2^SpreadingInterval], expressed in ms, before</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; attempting to transmit its DIO.&nbsp; If the DIS =
does not include a</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Response Spreading =
option, the node is free to transmit the DIO as it</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; otherwise would.</span></div><div style=3D"margin:=
 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">[GP] if you could further =
elaborate this paragraph.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">The =E2=80=9CMUST wait for a =
time uniformly chosen=E2=80=9D is not clear the concept of randomness =
here.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; A Response Spreading option MAY be included =
inside a unicast DIS</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; message, but there =
is no benefit in doing so.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Multiple Response =
Spreading options SHOULD NOT be used inside a same</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; DIS message.</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; This mechanism MUST =
NOT affect the Trickle timer mechanism.</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">4.3.&nbsp; DIO Option =
Request</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0 &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1 &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 2</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0 1 2 3 4 5 6 =
7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; =
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; Type =3D 0x0C&nbsp; |&nbsp; =
&nbsp; Length &nbsp; &nbsp; | Req. Opt. Type|</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Figure 3: The DIO Option Request =
option</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; If a unicast DIS is used to request a DIO, then =
[RFC6550] mandates</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; that a =
Configuration option MUST be included in this DIO.&nbsp; =
The</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 7]</span></div><p style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Configuration =
option contains generally static information that stays</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; unmodified throughout the DAG.&nbsp; For =
scenarios where a RPL node is</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; already part of a =
DAG and hence is holding the information that is</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; propagated with the Configuration option, an =
inclusion of such leads</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; to an unnecesary =
inflation of 16 bytes for each solicited DIO.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; As per [RFC6550], =
no process is defined to trigger the inclusion of</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; other DIO options in a solicited =
DIO.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; This document defines a new RPL control message =
option called DIO</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Option Request =
option, shown in Figure 3, with a recommended Type</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; value of 0x0C (to be confirmed by IANA).&nbsp; =
This new option allows full</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; control over the =
options of the solicited DIO.&nbsp; The target of a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; unicast or multicast DIS with the R flag set and =
with one or more DIO</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Option Request =
options included, MUST include these requested options</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; in the solicited DIO.&nbsp; For a DIS with the R =
flag unset, a RPL router</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; behaves like =
described in [RFC6550] with regard to DIO options.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">5.&nbsp; Full behavior =
illustration</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Figure 4 and Figure 5 illustrate the normative =
behavior described in</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Section 3 and =
Section 4.1.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; =
+--------------------+----------------------</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; Unicast DIS &nbsp; &nbsp; | &nbsp; =
&nbsp; &nbsp; &nbsp; Multicast DIS</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; =
+--------------------+--------------------+-</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&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; N=3D0&nbsp; &nbsp; =
&nbsp; &nbsp; |</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
+--------------------+--------------------+--------------------+-</span></=
div><div style=3D"margin: 0px; line-height: normal; font-family: =
Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
|&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | =
unicast DIO, &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; | no option present&nbsp; | =
don't&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | do &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | reset Trickle timer| reset =
Trickle timer|</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
+--------------------+--------------------+--------------------+-</span></=
div><div style=3D"margin: 0px; line-height: normal; font-family: =
Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; | =
Solicited Informa- |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; |</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; | =
tion/Metric Contai-| do nothing &nbsp; &nbsp; &nbsp; &nbsp; | do nothing =
&nbsp; &nbsp; &nbsp; &nbsp; |</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; | ner =
option present,|&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; |</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; | not =
matching.&nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; |</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
+--------------------+--------------------+--------------------+-</span></=
div><div style=3D"margin: 0px; line-height: normal; font-family: =
Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; | =
Solicited Informa- | unicast DIO, &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; | =
tion/Metric Contai-| don't&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; | do &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; | ner =
option present,| reset Trickle timer| reset Trickle =
timer|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; | =
matching.&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; |</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
+--------------------+--------------------+--------------------+-</span></=
div><div style=3D"margin: 0px; line-height: normal; font-family: =
Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Figure 4: =
Overall DIS behavior, part 1</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">[GP] the don=E2=80=99t =E2=80=94&g=
t; do not</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Notice that Figure 4 is indeed identical to =
Table 1 when Metric</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Container options =
are not used in DIS.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Gundogan, et al. &nbsp; &nbsp; &nbsp; Expires September 14, =
2017 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; [Page =
8]</span></div><p style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; -------------------------------------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; Multicast DIS &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; ----------------------+--------------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; N=3D1, T=3D0&nbsp; =
&nbsp; &nbsp; |&nbsp; &nbsp; &nbsp; N=3D1, T=3D1&nbsp; &nbsp; &nbsp; =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; -+--------------------+--------------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | multicast DIO, &nbsp; &nbsp; | unicast =
DIO, &nbsp; &nbsp; &nbsp; |</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; | don't&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | =
don't&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | reset Trickle timer| reset Trickle =
timer|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; -+--------------------+--------------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&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; |</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; | do nothing &nbsp; &nbsp; &nbsp; &nbsp; | do nothing &nbsp; =
&nbsp; &nbsp; &nbsp; |</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&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; |</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&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; |</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; -+--------------------+--------------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | multicast DIO, &nbsp; &nbsp; | unicast =
DIO, &nbsp; &nbsp; &nbsp; |</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; | don't&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | =
don't&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; | reset Trickle timer| reset Trickle =
timer|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&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; |</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; -+--------------------+--------------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Figure 5: Overall DIS behavior, part =
2</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">[GP] =
the don=E2=80=99t =E2=80=94&gt; do not</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; For the sake of =
completeness, let's remind here that a specific, one-</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; shot DIO generated in response to a DIS with the =
R flag unset MUST</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; contain a =
Configuration option.&nbsp; If the R flag is set, then this =
DIO</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; contains only =
explicitely requested DIO options.&nbsp; This DIO's</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; transmission is delayed according to the Delay =
Spreading option of</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; the DIS, if one =
such option is present.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">6.&nbsp; IANA =
Considerations</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">6.1.&nbsp; DIS Flags</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; IANA is requested =
to allocate bits 0, 1 and 2 of the DIS Flag Field</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; to become the "No Inconsistency", "DIO Type", =
and "DIO Option</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Request" bits, the =
functionality of which is described in Section 3</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; of this document.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; =
+-------+--------------------+---------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | Value |&nbsp; &nbsp; &nbsp; =
Meaning &nbsp; &nbsp; &nbsp; | &nbsp; Reference &nbsp; =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; =
+-------+--------------------+---------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; 0 &nbsp; |&nbsp; No =
Inconsistency&nbsp; | This document |</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | &nbsp; 1 &nbsp; |&nbsp; =
&nbsp; &nbsp; DIO Type&nbsp; &nbsp; &nbsp; | This document =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; | &nbsp; 2 &nbsp; | DIO Option Request | This =
document |</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; =
+-------+--------------------+---------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Gundogan, et al. &nbsp; &nbsp; &nbsp; Expires September 14, =
2017 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; [Page =
9]</span></div><p style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">6.2.&nbsp; RPL Control Message =
Options</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; IANA is requested to allocate a new code point =
in the "RPL Control</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Message Options" =
registry for the "Response Spreading" option and the</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; "Dio Option Request" option, the behavior of =
which are described in</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Section 4.2 and =
Section 4.3, respectively.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">[GP] Dio =E2=80=94&gt; =
DIO</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
+-------+--------------------+---------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; | Value |&nbsp; &nbsp; &nbsp; =
Meaning &nbsp; &nbsp; &nbsp; | &nbsp; Reference &nbsp; =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; =
+-------+--------------------+---------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; |&nbsp; 0x0B | Response =
Spreading | This document |</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; |&nbsp; 0x0C | DIO Option Request | This document =
|</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; =
+-------+--------------------+---------------+</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; RPL Control =
Message Options</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">7.&nbsp; Security Considerations</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; =
TBA</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">8.&nbsp; Acknowledgements</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; A lot of text in =
this document originates from now-expired [I-</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; D.goyal-roll-dis-modifications] co-authored with =
M.&nbsp; Goyal.&nbsp; The</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; requirements and =
solutions also draw from now-expired [I-D.dejean-</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; roll-selective-dis] co-authored with N.&nbsp; =
Dejean.&nbsp; Their contribution</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; is deeply =
acknowledged.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; We also thank (TBA) for their useful feedback =
and discussion.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">9.&nbsp; References</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">9.1.&nbsp; Normative =
References</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; [RFC2119]&nbsp; Bradner, S., "Key words for use =
in RFCs to Indicate</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; Requirement Levels", BCP 14, RFC =
2119,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; DOI 10.17487/RFC2119, March 1997,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;<a =
href=3D"http://www.rfc-editor.org/info/rfc2119" =
class=3D"">http://www.rfc-editor.org/info/rfc2119</a>&gt;.</span></div><di=
v style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; [RFC6550]&nbsp; =
Winter, T., Ed., Thubert, P., Ed., Brandt, A., Hui, J.,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Kelsey, R., Levis, P., Pister, =
K., Struik, R., Vasseur,</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; JP., and R. Alexander, "RPL: IPv6 Routing Protocol =
for</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; Low-Power and Lossy Networks", RFC =
6550,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; DOI 10.17487/RFC6550, March 2012,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;<a =
href=3D"http://www.rfc-editor.org/info/rfc6550" =
class=3D"">http://www.rfc-editor.org/info/rfc6550</a>&gt;.</span></div><di=
v style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Gundogan, et al. &nbsp; &nbsp; &nbsp; Expires September 14, =
2017&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; [Page =
10]</span></div><p style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; [RFC6551]&nbsp; =
Vasseur, JP., Ed., Kim, M., Ed., Pister, K., Dejean, =
N.,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; and D. Barthel, "Routing Metrics Used for Path =
Calculation</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; in Low-Power and Lossy Networks", RFC =
6551,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; DOI 10.17487/RFC6551, March 2012,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;<a =
href=3D"http://www.rfc-editor.org/info/rfc6551" =
class=3D"">http://www.rfc-editor.org/info/rfc6551</a>&gt;.</span></div><di=
v style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">9.2.&nbsp; Informative =
References</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; [RFC4861]&nbsp; Narten, T., Nordmark, E., =
Simpson, W., and H. Soliman,</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; "Neighbor Discovery for IP version 6 (IPv6)", RFC =
4861,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; DOI 10.17487/RFC4861, September =
2007,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &lt;<a =
href=3D"http://www.rfc-editor.org/info/rfc4861" =
class=3D"">http://www.rfc-editor.org/info/rfc4861</a>&gt;.</span></div><di=
v style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; [RFC5184]&nbsp; =
Teraoka, F., Gogo, K., Mitsuya, K., Shibui, R., and K.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Mitani, "Unified Layer 2 (L2) =
Abstractions for Layer 3</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; (L3)-Driven Fast Handover", RFC =
5184,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; DOI 10.17487/RFC5184, May 2008,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;<a =
href=3D"http://www.rfc-editor.org/info/rfc5184" =
class=3D"">http://www.rfc-editor.org/info/rfc5184</a>&gt;.</span></div><di=
v style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; [RFC5881]&nbsp; =
Katz, D. and D. Ward, "Bidirectional Forwarding =
Detection</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; (BFD) for IPv4 and IPv6 (Single Hop)", RFC =
5881,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; DOI 10.17487/RFC5881, June 2010,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;<a =
href=3D"http://www.rfc-editor.org/info/rfc5881" =
class=3D"">http://www.rfc-editor.org/info/rfc5881</a>&gt;.</span></div><di=
v style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; [RFC6206]&nbsp; =
Levis, P., Clausen, T., Hui, J., Gnawali, O., and J. =
Ko,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; "The Trickle Algorithm", RFC 6206, DOI =
10.17487/RFC6206,</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; March 2011, &lt;<a =
href=3D"http://www.rfc-editor.org/info/rfc6206" =
class=3D"">http://www.rfc-editor.org/info/rfc6206</a>&gt;.</span></div><di=
v style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Appendix A.&nbsp; =
Applications</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; This section details two example mechanisms that =
use the DIS flags</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; and options defined =
in this document.&nbsp; The first mechanism describes</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; how a leaf node may join a desired DAG in an =
energy efficient manner.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; The second =
mechanism details how a node may identify defunct DAGs =
for</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; which it still =
maintains state.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">A.1.&nbsp; A Leaf Node Joining a DAG</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; A new leaf node =
that joins an established LLN runs an iterative</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; algorithm in which it requests (using multicast =
DIS) DIOs from</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; routers belonging =
to the desired DAG.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; The DIS message has the "No Inconsistency" flag =
set to prevent</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; resetting of =
Trickle timer in responding routers, thereby keeping =
the</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; aggregated number =
of transmissions low.&nbsp; It also has the "DIO Type"</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; flag set to make responding routers send unicast =
DIOs back, thereby</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; not triggering full =
reception in nearby nodes that have state-of-the-</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; art radio receivers with hardware-based address =
filtering.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 11]</span></div><p style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; The DIS message can =
include a Response Spreading option prescribing a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; suitable spreading interval based on the =
expected density of nearby</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; routers and on the =
expected Layer 2 technology.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; The DIS will likely =
include a Metric Container listing the routing</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; constraints that the responding routers must =
satisfy in order to be</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; allowed to =
respond.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; At each iteration, the node multicasts such a =
DIS and waits for</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; forthcoming =
DIOs.&nbsp; After a time equal to the spreading interval, =
the</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; node considers the =
current iteration to be unsuccessful.&nbsp; The node</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; consequently relaxes the routing constraints =
somewhat and proceeds to</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; the next =
iteration.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; The cycle repeats until the node receives one or =
more DIOs or until</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; it has relaxed the =
constraints to the lowest acceptable values.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; This algorithm has =
been proven in the field to be extremely energy-</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; efficient, especially when routers have a wide =
communication range.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">A.2.&nbsp; Identifying A Defunct DAG</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; A RPL node may =
remove a neighbor from its parent set for a DAG for a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; number of reasons:</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; The =
neighbor is no longer reachable, as determined using a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; mechanism such as Neighbor Unreachanility Detection =
(NUD)</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; [RFC4861], =
Bidirectional Forwarding Detection (BFD) [RFC5881] or</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; L2 triggers [RFC5184]; or</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; The =
neighbor advertises an infinite rank in the DAG; or</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; Keeping the =
neighbor as a parent would required the node to</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; increase its rank beyond L + DAGMaxRankIncrease, where L =
is the</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; minimum =
rank the node has had in this DAG; or</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; The =
neighbor advertises membership in a different DAG within =
the</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; same RPL =
Instance, where a different DAG is recognised by a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; different DODAGID or a different =
DODAGVersionNumber.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Even if the conditions listed above exist, a RPL =
node may fail to</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; remove a neighbor =
from its parent set because:</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; The node =
may fail to receive the neighbor's DIOs advertising an</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; increased rank or the neighbor's membership in a different =
DAG;</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; o&nbsp; The node may not check, and hence may =
not detect, the neighbor's</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; =
unreachability for a long time.&nbsp; For example, the node may =
not</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 12]</span></div><p style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; have any =
data to send to this neighbor and hence may not =
encounter</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; any event =
(such as failure to send data to this neighbor) that</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; would trigger a check for the neighbor's =
reachability.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; In such cases, a node would continue to consider =
itself attached to a</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; DAG even if all its =
parents in the DAG are unreachable or have moved</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; to different DAGs.&nbsp; Such a DAG can be =
characterized as being defunct</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; from the node's =
perspective.&nbsp; If the node maintains state about a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; large number of defunct DAGs, such state may =
prevent a considerable</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; portion of the =
total memory in the node from being available for more</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; useful purposes.</span></div><div style=3D"margin:=
 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; To alleviate the =
problem described above, a RPL node may invoke the</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; following procedure to identify a defunct DAG =
and delete the state it</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; maintains for this =
DAG.&nbsp; Note that, given the proactive nature of RPL</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; protocol, the lack of data traffic using a DAG =
can not be considered</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; a reliable =
indication of the DAG's defunction.&nbsp; Further, the =
Trickle</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; timer based control =
of DIO transmissions means the possibility of an</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; indefinite delay in the receipt of a new DIO =
from a functional DAG</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; parent.&nbsp; =
Hence, the mechanism described here is based on the use of =
a</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; DIS message to =
solicit DIOs about a DAG suspected of defunction.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Further, a multicast DIS is used so as to avoid =
the need to query</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; each parent =
individually and also to discover other neighbor =
routers</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; that may serve as =
the node's new parents in the DAG.</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; When a RPL node has =
not received a DIO from any of its parents in a</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; DAG for more than a locally configured time =
duration:</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; o&nbsp; The node generates a multicast DIS =
message with:</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; *&nbsp; the "No Inconsistency" flag set so that the =
responding routers</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; do not reset their Trickle timers.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; *&nbsp; the =
"DIO Type" flag not set so that the responding routers =
send</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; multicast DIOs and other nodes in the vicinity do not need =
to</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; invoke this procedure.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; *&nbsp; a =
Solicited Information option to identify the DAG in =
question.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; This option must have the I and D flags set and =
the</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; RPLInstanceID/DODAGID fields must be set to values =
identifying</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; the DAG.&nbsp; The V flag inside the Solicited Information =
option</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; should not be set so as to allow the neighbors to send =
DIOs</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; advertising the latest version of the DAG.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; *&nbsp; a =
Response Spreading option specifying a suitable time =
interval</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; over which the DIO responses may arrive.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 13]</span></div><p style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; After =
sending the DIS, the node waits for the duration =
specified</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; inside the =
Response Spreading option to receive the DIOs generated</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; by its neighbors.&nbsp; At the conclusion of the wait =
duration:</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; *&nbsp; If the node has received one or more DIOs =
advertising newer</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; version(s) of the DAG, it joins the latest version of the =
DAG,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; selects a new parent set among the neighbors advertising =
the</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; latest DAG version and marks the DAG status as =
functional.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; *&nbsp; Otherwise, if the node has not received a DIO =
advertising the</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; current version of the DAG from a neighbor in the parent =
set,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; it removes that neighbor from the parent set.&nbsp; As a result, =
if</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; the node has no parent left in the DAG, it marks the DAG =
as</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; defunct and schedule the deletion of the state it =
has</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; maintained for the DAG after a locally configured =
"hold"</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; duration.&nbsp; (This is because, as per RPL specification, when =
a</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; node no longer has any parents left in a DAG, it is =
still</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; required to remember the DAG's identity =
(RPLInstanceID,</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; DODAGID, DODAGVersionNumber), the lowest rank (L) it has had =
in</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; this DAG and the DAGMaxRankIncrease value for the DAG for =
a</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; certain time interval to ensure that the node does not join =
an</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; earlier version of the DAG and does not rejoin the =
current</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; =
&nbsp; version of the DAG at a rank higher than L +</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; =
DAGMaxRankIncrease.)</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">A.3.&nbsp; Explicit and Implicit DIO Option =
Requests</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Certain information from a DIO is only needed =
occasionally or for</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; specific =
events:</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; o&nbsp; A Configuration option contains =
information that is static and</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; stays =
mostly unchanged during the lifetime of the DODAG.&nbsp; =
Thus,</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; the =
Configuration option is important when joining the DODAG, =
but</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; inflates =
the DIO unnecessarily thereafter.</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; o&nbsp; A Prefix =
Information option is also useful when joining a DODAG =
to</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; perform =
address autoconfiguration and propagating the prefixes.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; After that, it is only relevant when changes occure that =
would</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; affect the =
prefix information (new prefixes, lifetime updates,</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" class=3D"">&nbsp; =
&nbsp; &nbsp; ...).</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; o&nbsp; More DIO options may be added in the =
future that have similar</span></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp; &nbsp; &nbsp; properties =
as mentioned above.</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; The Configuration and Prefix Information options =
may be omitted from</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; the trickle timer =
based DIOs, leading to less bytes for each DIO.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Once a RPL router decides to join a DODAG, it =
may solicit a DIO by</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; sending a DIS with =
the R flag set and two "DIO Option Request"</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Gundogan, et al. &nbsp; &nbsp; &nbsp; Expires September 14, =
2017&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; [Page =
14]</span></div><p style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span></p><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">Internet-Draft&nbsp; &nbsp; =
draft-ietf-roll-dis-modifications-00&nbsp; &nbsp; &nbsp; &nbsp; March =
2017</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; options =
included.&nbsp; One for the Configuration option, the other =
for</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; the Prefix =
Information option.&nbsp; Upon receiving these options in =
the</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; next DIO, the RPL =
router can successfully finish the joining process.</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Appendix B.&nbsp; Experimental =
data</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; The effectiveness of these flags and options has =
been measured on</span></div><div style=3D"margin: 0px; line-height: =
normal; font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; real industrial =
hardware.</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Data to be added</span></div><div style=3D"margin:=
 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Authors' =
Addresses</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Cenk Gundogan (editor)</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; HAW Hamburg</span></div><div style=3D"margin: =
0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Email: <a =
href=3D"mailto:cenk.guendogan@haw-hamburg.de" =
class=3D"">cenk.guendogan@haw-hamburg.de</a></span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Dominique =
Barthel</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; =
Orange</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; 28 Chemin Du Vieux =
Chene, BP 98</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Meylan&nbsp; =
38243</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; =
France</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Email: <a =
href=3D"mailto:dominique.barthel@orange.com" =
class=3D"">dominique.barthel@orange.com</a></span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; Emmanuel =
Baccelli</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">&nbsp;&nbsp; =
INRIA</span></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Phone: +33-169-335-511</span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; Email: <a =
href=3D"mailto:Emmanuel.Baccelli@inria.fr" =
class=3D"">Emmanuel.Baccelli@inria.fr</a></span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial;" class=3D""><span style=3D"font-kerning: none" =
class=3D"">&nbsp;&nbsp; URI: &nbsp; <a =
href=3D"http://www.emmanuelbaccelli.org/" =
class=3D"">http://www.emmanuelbaccelli.org/</a></span></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial; min-height: 14px;" class=3D""><span =
style=3D"font-kerning: none" class=3D""></span><br class=3D""></div><div =
style=3D"margin: 0px; line-height: normal; font-family: Courier; =
-webkit-text-stroke-color: rgb(0, 0, 0); -webkit-text-stroke-width: =
initial; min-height: 14px;" class=3D""><span style=3D"font-kerning: =
none" class=3D""></span><br class=3D""></div><div style=3D"margin: 0px; =
line-height: normal; font-family: Courier; -webkit-text-stroke-color: =
rgb(0, 0, 0); -webkit-text-stroke-width: initial; min-height: 14px;" =
class=3D""><span style=3D"font-kerning: none" class=3D""></span><br =
class=3D""></div><div style=3D"margin: 0px; line-height: normal; =
font-family: Courier; -webkit-text-stroke-color: rgb(0, 0, 0); =
-webkit-text-stroke-width: initial;" class=3D""><span =
style=3D"font-kerning: none" class=3D"">Gundogan, et al. &nbsp; &nbsp; =
&nbsp; Expires September 14, 2017&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; [Page 15]</span></div></div><div class=3D""><span =
style=3D"font-kerning: none" class=3D""><br class=3D""></span></div><div =
class=3D""><br class=3D""></div><div class=3D""><br class=3D""><div =
class=3D"">
<div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; orphans: =
auto; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D""><div class=3D"">____________________________________</div><div =
class=3D""><br class=3D""></div><div class=3D"">Georgios Z. =
Papadopoulos, Ph.D.</div><div class=3D"">Associate Professor, IMT =
Atlantique, Rennes</div><div class=3D""><br class=3D""></div><div =
class=3D"">web:&nbsp;<span class=3D"Apple-tab-span" style=3D"white-space: =
pre;">	</span>&nbsp;<a href=3D"http://www.georgiospapadopoulos.com" =
class=3D"">www.georgiospapadopoulos.com</a><br class=3D"">twitter:<span =
class=3D"Apple-converted-space">&nbsp;</span><span =
class=3D"Apple-tab-span" style=3D"white-space: pre;">	</span><a =
href=3D"https://twitter.com/gzpapadopoulos?ref_src=3Dtwsrc%5Etfw&amp;ref_u=
rl=3Dhttp://georgiospapadopoulos.com/" =
class=3D"">@gzpapadopoulos</a></div><div class=3D"">tel:<span =
class=3D"Apple-tab-span" style=3D"white-space: pre;">		=
</span>+33 (0)2 99 12 70 04</div><div =
class=3D"">____________________________________</div></div></div></div></d=
iv></div></div>
</div>
<br class=3D""></div></body></html>=

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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Mon, 22 Jul 2019 18:40:37 +0300
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Subject: Re: [Roll] Call for reviews for draft-koutsiamanis-roll-traffic-aware-of-00
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Dear all,

This is a kindly reminder please let us know if you are willing to
review draft-koutsiamanis-roll-traffic-aware-of-00

Thank you very much in advance,

Ines and Peter

On Thu, Jun 6, 2019 at 1:14 PM Ines Robles <mariainesrobles@googlemail.com>
wrote:

> Dear all,
>
> We would like to have reviews
> for draft-koutsiamanis-roll-traffic-aware-of-00.
>
> Please let us know if you want to review it
>
> Thank you very much,
>
> Ines and Peter
>

--000000000000755700058e46e6d8
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<div dir=3D"ltr">Dear all,<br><div><br></div><div>This is a kindly reminder=
 please let us know if you are willing to review=C2=A0draft-koutsiamanis-ro=
ll-traffic-aware-of-00</div><div><br></div><div>Thank you very much in adva=
nce,</div><div><br></div><div>Ines and Peter</div></div><br><div class=3D"g=
mail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Jun 6, 2019 at 1:=
14 PM Ines  Robles &lt;<a href=3D"mailto:mariainesrobles@googlemail.com">ma=
riainesrobles@googlemail.com</a>&gt; wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex"><div dir=3D"ltr">Dear all,<div><br></div><div>W=
e would like to have reviews for=C2=A0draft-koutsiamanis-roll-traffic-aware=
-of-00.</div><div><br></div><div>Please let us know if you want to review i=
t<br></div><div><br></div><div>Thank you very much,</div><div><br></div><di=
v>Ines and Peter</div></div>
</blockquote></div>

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From nobody Wed Jul 24 07:28:42 2019
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From: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Roll] Call for reviews for draft-koutsiamanis-roll-traffic-aware-of-00
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On 2019-06-06 6:14 a.m., Ines Robles wrote:
> Dear all,
> 
> We would like to have reviews 
> for draft-koutsiamanis-roll-traffic-aware-of-00.

I have read it. It seems like it is way overdue to have this work.

} The difficulty lies in the method of partitioning the traffic to 
multiple parents.

But, what about the cost of the downward traffic?  We have to attach to 
one parent or the other to get traffic routed right.  Maybe in 
non-storing we can do something smarter with projected-DAO?

It's good that [I-D.ietf-6tisch-enrollment-enhanced-beacon] is 
referenced.  But maybe 
https://datatracker.ietf.org/doc/draft-richardson-6tisch-roll-enrollment-priority/ 
also needs to be updated to
take into account the remaining throughput priority.

I think that the document would benefit from distinguishing between the 
cases where a node has already enrolled from the situation where the 
node needs to enroll.  The set of information is not the same.


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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Wed, 24 Jul 2019 22:06:05 +0300
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Subject: [Roll] WGAdoption for draft-rahul-roll-mop-ext
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Dear all,

This is a WG adoption call for draft-rahul-roll-mop-ext from 24-07-2019 to
07-08-2019.

Please let us know your comments,

Thanks,

Ines and Peter

--000000000000f16c4a058e720080
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<div dir=3D"ltr">Dear all,<br><div><br></div><div>This is a WG adoption cal=
l for=C2=A0draft-rahul-roll-mop-ext from 24-07-2019 to 07-08-2019.</div><di=
v><br></div><div>Please let us know your comments,</div><div><br></div><div=
>Thanks,</div><div><br></div><div>Ines and Peter</div></div>

--000000000000f16c4a058e720080--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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From nobody Wed Jul 24 13:16:34 2019
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Subject: Re: [Roll] WGAdoption for draft-rahul-roll-mop-ext
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I support this work.

Best,
Yatch

On 7/24/2019 3:59 PM, Pascal Thubert (pthubert) wrote:
> Support
> 
> This is an infrastructure document. We need it yesterday so we can use it in the other drafts.
> 
> 
> Regards,
> 
> Pascal
> 
>> Le 24 juil. 2019 à 15:06, Ines Robles <mariainesrobles=40googlemail.com@dmarc.ietf.org> a écrit :
>>
>> Dear all,
>>
>> This is a WG adoption call for draft-rahul-roll-mop-ext from 24-07-2019 to 07-08-2019.
>>
>> Please let us know your comments,
>>
>> Thanks,
>>
>> Ines and Peter
>> _______________________________________________
>> Roll mailing list
>> Roll@ietf.org
>> https://www.ietf.org/mailman/listinfo/roll
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll
> 


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Comments: In-reply-to Ines Robles <mariainesrobles=40googlemail.com@dmarc.ietf.org> message dated "Wed, 24 Jul 2019 22:06:05 +0300."
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--=-=-=
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Ines Robles <mariainesrobles=3D40googlemail.com@dmarc.ietf.org> wrote:
    > This is a WG adoption call for draft-rahul-roll-mop-ext from 24-07-20=
19 to
    > 07-08-2019.

    > Please let us know your comments,

I have read the document, and I think it should be adopted.
I think that the mop=3D=3D7 calculation should be changed, but we can do th=
at
after adoption.


=2D-=20
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
 -=3D IPv6 IoT consulting =3D-




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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Thread-Topic: [Roll] WGAdoption for draft-rahul-roll-mop-ext
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Subject: Re: [Roll] WGAdoption for draft-rahul-roll-mop-ext
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Agree with Michael here;

The suggestion I made at the mike in addition to this was that 7 in the MOP=
 means that the MOP is in the ext. If there is no ext then the MOP is elide=
d in this DIO, need to wait for the next one.

All the best,

Pascal

> -----Original Message-----
> From: Roll <roll-bounces@ietf.org> On Behalf Of Michael Richardson
> Sent: mercredi 24 juillet 2019 14:31
> To: Routing Over Low power and Lossy networks <roll@ietf.org>
> Subject: Re: [Roll] WGAdoption for draft-rahul-roll-mop-ext
>=20
>=20
> Ines Robles <mariainesrobles=3D40googlemail.com@dmarc.ietf.org> wrote:
>     > This is a WG adoption call for draft-rahul-roll-mop-ext from 24-07-=
2019 to
>     > 07-08-2019.
>=20
>     > Please let us know your comments,
>=20
> I have read the document, and I think it should be adopted.
> I think that the mop=3D=3D7 calculation should be changed, but we can do =
that
> after adoption.
>=20
>=20
> --
> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works  -
> =3D IPv6 IoT consulting =3D-
>=20
>=20


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Comments: In-reply-to "Pascal Thubert (pthubert)" <pthubert@cisco.com> message dated "Wed, 24 Jul 2019 21:47:35 -0000."
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Subject: [Roll] eliding mop ext
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--=-=-=
Content-Type: text/plain
Content-Transfer-Encoding: quoted-printable


Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    > The suggestion I made at the mike in addition to this was that 7 in t=
he
    > MOP means that the MOP is in the ext. If there is no ext then the MOP
    > is elided in this DIO, need to wait for the next one.

the mop is in every DIO.
You are suggesting that the mopext might not need to be sent in every DIO?

=2D-=20
]               Never tell me the odds!                 | ipv6 mesh network=
s [=20
]   Michael Richardson, Sandelman Software Works        | network architect=
  [=20
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails  =
  [=20
=09

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: Add ROVR in DAO?
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Subject: [Roll] Add ROVR in DAO?
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Dear all

The only change I foresee in the unaware leaves draft is the addition of th=
e RFC 8505 ROVR from the ND EARO into the DAO. After that I'd feel ready to=
 call for WGLC.

The proposed change enables to build a full EDAR message at the root, and a=
voids the weird processing of the keep-alive EDAR (see https://tools.ietf.o=
rg/html/draft-ietf-roll-unaware-leaves-02#section-7.4)
If we do it now we can forget that weird format (all ones RIVR) and never c=
ode for it. This may also be useful when we work on securing the DAO using =
the AP ND proof of ownership all the way to the root.

Please let me know if there's disagreement to make that change

All the best

Pascal






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<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The only change I foresee in the unaware leaves draf=
t is the addition of the RFC 8505 ROVR from the ND EARO into the DAO. After=
 that I&#8217;d feel ready to call for WGLC.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The proposed change enables to build a full EDAR mes=
sage at the root, and avoids the weird processing of the keep-alive EDAR (s=
ee https://tools.ietf.org/html/draft-ietf-roll-unaware-leaves-02#section-7.=
4)<o:p></o:p></p>
<p class=3D"MsoNormal">If we do it now we can forget that weird format (all=
 ones RIVR) and never code for it. This may also be useful when we work on =
securing the DAO using the AP ND proof of ownership all the way to the root=
.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please let me know if there&#8217;s disagreement to =
make that change<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All the best<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] eliding mop ext
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Subject: Re: [Roll] eliding mop ext
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Yes, that was actually Rahul's suggestion.=20

We already elide the DODAG configuration option in some DIOs. This may be e=
lided as well in some DIO messages if room is needed for something else.
Hopefully it would be elided only if there is a good reason.

All the best,

Pascal

> -----Original Message-----
> From: Roll <roll-bounces@ietf.org> On Behalf Of Michael Richardson
> Sent: mercredi 24 juillet 2019 14:52
> To: Routing Over Low power and Lossy networks <roll@ietf.org>
> Subject: [Roll] eliding mop ext
>=20
>=20
> Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
>     > The suggestion I made at the mike in addition to this was that 7 in=
 the
>     > MOP means that the MOP is in the ext. If there is no ext then the M=
OP
>     > is elided in this DIO, need to wait for the next one.
>=20
> the mop is in every DIO.
> You are suggesting that the mopext might not need to be sent in every DIO=
?
>=20
> --
> ]               Never tell me the odds!                 | ipv6 mesh netwo=
rks [
> ]   Michael Richardson, Sandelman Software Works        | network archite=
ct  [
> ]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails=
    [
>=20


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: [Roll] stitching PDAO segments
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Dear all

Following up on stitching PDAO paths at the meeting today:

As you know, a 6TiSCH Track can be a lot more complex than a sequence of no=
des (see https://tools.ietf.org/html/draft-ietf-6tisch-architecture-24#sect=
ion-4.5.3)
It results that deploying a Track requires stitching segments into a DODAG =
from source to destination.
What makes the most sense for a 6TISCH Track is probably that each track is=
 defined as a DODAG local instance for the source. All the PDAO segments wo=
uld be stitched together into that DODAG to form a Track.
The current draft allows for this but a section that explains it all would =
certainly be useful.

Are we all OK that I propose some text about that?

All the best

Pascal

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<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Following up on stitching PDAO paths at the meeting =
today:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As you know, a 6TiSCH Track can be a lot more comple=
x than a sequence of nodes (see https://tools.ietf.org/html/draft-ietf-6tis=
ch-architecture-24#section-4.5.3)<o:p></o:p></p>
<p class=3D"MsoNormal">It results that deploying a Track requires stitching=
 segments into a DODAG from source to destination.<o:p></o:p></p>
<p class=3D"MsoNormal">What makes the most sense for a 6TISCH Track is prob=
ably that each track is defined as a DODAG local instance for the source. A=
ll the PDAO segments would be stitched together into that DODAG to form a T=
rack.<o:p></o:p></p>
<p class=3D"MsoNormal">The current draft allows for this but a section that=
 explains it all would certainly be useful.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Are we all OK that I propose some text about that?<o=
:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All the best<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
</body>
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Dear all

Following up on the WG meeting today:

It makes sense to make the draft complete by adding a sibling information i=
n the Non storing mode DAO to the root. This was the root can compute more =
optimized P DAO.

Are we OK that I include some text and a proposed format about that in the =
next revision?

All the best

Pascal

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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Following up on the WG meeting today:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">It makes sense to make the draft complete by adding =
a sibling information in the Non storing mode DAO to the root. This was the=
 root can compute more optimized P DAO.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Are we OK that I include some text and a proposed fo=
rmat about that in the next revision?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All the best<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
</body>
</html>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: Querying PDAO
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Subject: Re: [Roll] Querying PDAO
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Comments: In-reply-to "Li Zhao (liz3)" <liz3@cisco.com> message dated "Wed, 24 Jul 2019 23:41:49 -0000."
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Subject: Re: [Roll] Querying PDAO
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Li Zhao (liz3) <liz3@cisco.com> wrote:
    > Following up on querying PDAO from root at the meeting today:

    > It makes sense to provide a querying mechanism for node which can get=
 PDAO
    > from root. Then node can query special PDAO route entry according to =
its
    > special requirement. For example, route hop, latency, route algorithm,
    > remaining lifetime.

So, if I understand, you are asking that a given node X, having traffic to
node Y, should be able to ask the root to project a DAO towards Y?

=2D-=20
]               Never tell me the odds!                 | ipv6 mesh network=
s [=20
]   Michael Richardson, Sandelman Software Works        | network architect=
  [=20
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails  =
  [=20
=09

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From nobody Wed Jul 24 17:33:47 2019
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From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: Sibling information
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Hi Pascal,

Isn't it already possible to send multiple Transit Information Option in DA=
O in non-storing MOP for a node to inform root of node's multiple parents?
I understand you mentioned sibling information but I am wondering how root =
makes use of sibling information to optimize P-DAO. I can clearly relate ho=
w root can use multiple parent's info to optimize P-DAO but not sure how si=
bling info will help.

Regards,
Rahul


From: Roll [mailto:roll-bounces@ietf.org] On Behalf Of Pascal Thubert (pthu=
bert)
Sent: 25 July 2019 06:12
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Subject: [Roll] Sibling information

Dear all

Following up on the WG meeting today:

It makes sense to make the draft complete by adding a sibling information i=
n the Non storing mode DAO to the root. This was the root can compute more =
optimized P DAO.

Are we OK that I include some text and a proposed format about that in the =
next revision?

All the best

Pascal

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Pascal,<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">Isn&#8217;t it already=
 possible to send multiple Transit Information Option in DAO in non-storing=
 MOP for a node to inform root of node&#8217;s multiple parents?<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I understand you menti=
oned sibling information but I am wondering how root makes use of sibling i=
nformation to optimize P-DAO. I can clearly relate how root can use multipl=
e parent&#8217;s info to optimize P-DAO but
 not sure how sibling info will 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">Regards,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Rahul<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"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Roll [mailto:roll-bounces@ietf.org] <b>=
On Behalf Of
</b>Pascal Thubert (pthubert)<br>
<b>Sent:</b> 25 July 2019 06:12<br>
<b>To:</b> Routing Over Low power and Lossy networks &lt;roll@ietf.org&gt;<=
br>
<b>Subject:</b> [Roll] Sibling information<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Following up on the WG meeting today:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">It makes sense to make the draft complete by adding =
a sibling information in the Non storing mode DAO to the root. This was the=
 root can compute more optimized P DAO.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Are we OK that I include some text and a proposed fo=
rmat about that in the next revision?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All the best<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
</body>
</html>

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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/ugEs_EyI9F9zEQ6VV2l0-xZf6J4>
Subject: Re: [Roll] stitching PDAO segments
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Hi Pascal,

I thought 6TiSCH Track forwarding is a completely different forwarding sche=
me
from RPL/IPv6 forwarding, as implied in https://tools.ietf.org/html/draft-i=
etf-6tisch-architecture-24#section-3.6

In that case, we don't have to relate DAO projection and Track, I think.
Or, maybe DAO projection is one implementation of Track forwarding, with RP=
L root playing
the role of PCE?


From: Roll <roll-bounces@ietf.org> On Behalf Of Pascal Thubert (pthubert)
Sent: Thursday, July 25, 2019 7:10 AM
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Subject: [Roll] stitching PDAO segments

Dear all

Following up on stitching PDAO paths at the meeting today:

As you know, a 6TiSCH Track can be a lot more complex than a sequence of no=
des (see https://tools.ietf.org/html/draft-ietf-6tisch-architecture-24#sect=
ion-4.5.3)
It results that deploying a Track requires stitching segments into a DODAG =
from source to destination.
What makes the most sense for a 6TISCH Track is probably that each track is=
 defined as a DODAG local instance for the source. All the PDAO segments wo=
uld be stitched together into that DODAG to form a Track.
The current draft allows for this but a section that explains it all would =
certainly be useful.

Are we all OK that I propose some text about that?

All the best

Pascal

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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D">Hi Pascal,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D">I thought 6TiSCH Track forwarding is a completel=
y different forwarding scheme<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D">from RPL/IPv6 forwarding, as implied in https://=
tools.ietf.org/html/draft-ietf-6tisch-architecture-24#section-3.6<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D">In that case, we don't have to relate DAO projec=
tion and Track, I think.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D">Or, maybe DAO projection is one implementation o=
f Track forwarding, with RPL root playing<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D">the role of PCE?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;MS G=
othic&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0mm 0mm 0mm =
4.0pt">
<div>
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0mm 0mm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Roll &lt;roll-bounces@ietf.org&gt;
<b>On Behalf Of </b>Pascal Thubert (pthubert)<br>
<b>Sent:</b> Thursday, July 25, 2019 7:10 AM<br>
<b>To:</b> Routing Over Low power and Lossy networks &lt;roll@ietf.org&gt;<=
br>
<b>Subject:</b> [Roll] stitching PDAO segments<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear all<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Following up on stitching PDAO =
paths at the meeting today:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">As you know, a 6TiSCH Track can=
 be a lot more complex than a sequence of nodes (see
<a href=3D"https://tools.ietf.org/html/draft-ietf-6tisch-architecture-24#se=
ction-4.5.3">
https://tools.ietf.org/html/draft-ietf-6tisch-architecture-24#section-4.5.3=
</a>)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It results that deploying a Tra=
ck requires stitching segments into a DODAG from source to destination.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">What makes the most sense for a=
 6TISCH Track is probably that each track is defined as a DODAG local insta=
nce for the source. All the PDAO segments would be stitched together into t=
hat DODAG to form a Track.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The current draft allows for th=
is but a section that explains it all would certainly be useful.<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Are we all OK that I propose so=
me text about that?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">All the best<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Pascal<o:p></o:p></span></p>
</div>
</div>
</body>
</html>

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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/Z-ZZzL-NAVfgJAir35gG6YtCpkU>
Subject: Re: [Roll] Sibling information
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--_000_OSAPR01MB2372460662A3307898F755B9E5C10OSAPR01MB2372jpnp_
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Hi Pascal,

I'm interested in this feature.

Having a standardized way to collect (both DIO- and DAO-based) topology inf=
ormation sounds useful for
management and monitoring purposes, too.


From: Roll <roll-bounces@ietf.org> On Behalf Of Pascal Thubert (pthubert)
Sent: Thursday, July 25, 2019 7:12 AM
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Subject: [Roll] Sibling information

Dear all

Following up on the WG meeting today:

It makes sense to make the draft complete by adding a sibling information i=
n the Non storing mode DAO to the root. This was the root can compute more =
optimized P DAO.

Are we OK that I include some text and a proposed format about that in the =
next revision?

All the best

Pascal

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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;=1B$=
B#M#S=1B(B =1B$B%4%7%C%/=1B(B&quot;;color:#1F497D">Hi Pascal,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;=1B$=
B#M#S=1B(B =1B$B%4%7%C%/=1B(B&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;=1B$=
B#M#S=1B(B =1B$B%4%7%C%/=1B(B&quot;;color:#1F497D">I'm interested in this f=
eature.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;=1B$=
B#M#S=1B(B =1B$B%4%7%C%/=1B(B&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;=1B$=
B#M#S=1B(B =1B$B%4%7%C%/=1B(B&quot;;color:#1F497D">Having a standardized wa=
y to collect (both DIO- and DAO-based) topology information sounds useful f=
or<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;=1B$=
B#M#S=1B(B =1B$B%4%7%C%/=1B(B&quot;;color:#1F497D">management and monitorin=
g purposes, too.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;=1B$=
B#M#S=1B(B =1B$B%4%7%C%/=1B(B&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-family:&quot;=1B$=
B#M#S=1B(B =1B$B%4%7%C%/=1B(B&quot;;color:#1F497D"><o:p>&nbsp;</o:p></span>=
</p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0mm 0mm 0mm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0mm =
0mm 0mm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Roll &lt;roll-bounces@ietf.org&gt;
<b>On Behalf Of </b>Pascal Thubert (pthubert)<br>
<b>Sent:</b> Thursday, July 25, 2019 7:12 AM<br>
<b>To:</b> Routing Over Low power and Lossy networks &lt;roll@ietf.org&gt;<=
br>
<b>Subject:</b> [Roll] Sibling information<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear all<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Following up on the WG meeting =
today:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">It makes sense to make the draf=
t complete by adding a sibling information in the Non storing mode DAO to t=
he root. This was the root can compute more optimized P DAO.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Are we OK that I include some t=
ext and a proposed format about that in the next revision?<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">All the best<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Pascal<o:p></o:p></span></p>
</div>
</div>
</body>
</html>

--_000_OSAPR01MB2372460662A3307898F755B9E5C10OSAPR01MB2372jpnp_--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Sibling information
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Subject: Re: [Roll] Sibling information
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Thread-Topic: [Roll] stitching PDAO segments
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Subject: Re: [Roll] stitching PDAO segments
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] stitching PDAO segments
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Subject: Re: [Roll] stitching PDAO segments
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From: "Li Zhao (liz3)" <liz3@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Querying PDAO
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Date: Thu, 25 Jul 2019 13:02:46 +0000
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References: <77E0C031-82C2-422A-9333-6F7B02C4B3C4@cisco.com> <10416.1564014159@dooku.sandelman.ca>
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From: "Li Zhao (liz3)" <liz3@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] WGAdoption for draft-rahul-roll-mop-ext
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I have read the draft and gave my review.
I support this document.

Georgios



> On Jul 24, 2019, at 15:06, Ines Robles =
<mariainesrobles=3D40googlemail.com@dmarc.ietf.org> wrote:
>=20
> Dear all,
>=20
> This is a WG adoption call for draft-rahul-roll-mop-ext from =
24-07-2019 to 07-08-2019.
>=20
> Please let us know your comments,
>=20
> Thanks,
>=20
> Ines and Peter
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll


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Comments: In-reply-to "Li Zhao (liz3)" <liz3@cisco.com> message dated "Thu, 25 Jul 2019 13:02:46 -0000."
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Subject: Re: [Roll] Querying PDAO
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--=-=-=
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Li Zhao (liz3) <liz3@cisco.com> wrote:
    > Correct. If the application on node X wants to ask a nearest path to
    > node Y, PDAO draft doesn't provide any mechanism.

P2PRPL tries to do this, but you are suggesting that instead of learing it,
the root should just know it.  This goes to some of the PCE cases, I think.

Is there PCE technology we can use?

DAO-projection does not create a route that is remembered, rather it prefix=
es
it to a particular packet.  So you'd want node X to be able to ask the root
for such a source route?

    > I think PDAO draft need to cover this case. Maybe how and when to use
    > PDAO is out of scope of this draft.=20
    > But at least we need to reserve the asking capability and define the
    > protocol.
=2D-=20
]               Never tell me the odds!                 | ipv6 mesh network=
s [=20
]   Michael Richardson, Sandelman Software Works        | network architect=
  [=20
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails  =
  [=20
=09

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Date: Thu, 25 Jul 2019 11:46:17 -0400
From: Peter van der Stok <stokcons@bbhmail.nl>
To: Roll <roll@ietf.org>
Organization: vanderstok consultancy
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Subject: [Roll] Summary of ROLL meeting
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Hi ROLL,

Our summary of ROLL meeting is shown below,

Ines and Peter 
draft-ietf-roll-dao-projection:  

Good progress on the draft that has become stable. Open issues are going
to be addressed . Pascal will suggest additions that have to be
discussed in ML. Draft depends on Mop-ext draft. 
draft-ietf-roll-unaware-leaves: 

Reviews on this draft are needed, Decision not to include MPL and
Trickle consequences. 
draft-ietf-roll-nsa-extension :  

This draft is pretty stable and no issues are known. Implementation is
deployed. WGLC to be started after a couple of reviews. 

draft-rahul-roll-mop-ext: 

Draft will keep both MOP and CAP subjects, use cases depend on both
aspects. Dao-projection depends on this draft. Proposal for adoption is
accepted. 
Draft-thubert-roll-turnon-rfc8138: 

No decision on this draft. For Peter, scope, purpose and relation to
existing decision algorithms need to be clarified. 
Discussion on ROLL-BIER: 

After several discussions the interests of the authors have become much
clearer. Due to changes in priorities the Design  Team is dissolved with
thanks to Toerless. The multicast draft by Carsten needs to place itself
with respect to the Bier Roll protocols envisaged by Pascal. 
Charter: 

The aim is not to change the charter and steer with milestones. 
-- 
Peter van der Stok
vanderstok consultancy
mailto: consultancy@vanderstok.org, stokcons@bbhmail.nl
www: www.vanderstok.org [1]
tel NL: +31(0)492474673     F: +33(0)966015248 

Links:
------
[1] http://www.vanderstok.org
--=_055883ca410add3a04904695acb6e667
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=UTF-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=
=3DUTF-8" /></head><body style=3D'font-size: 10pt; font-family: Verdana,Gen=
eva,sans-serif'>
<p><span style=3D"font-weight: 400;">Hi ROLL,<br /><br />Our summary of ROL=
L meeting is shown below,<br /><br />Ines and Peter</span></p>
<br />
<p><span style=3D"font-weight: 400;">draft-ietf-roll-dao-projection:&nbsp;<=
/span></p>
<p><span style=3D"font-weight: 400;">Good progress on the draft that has be=
come stable. Open issues are going to be addressed . Pascal will suggest ad=
ditions that have to be discussed in ML. Draft depends on Mop-ext draft.</s=
pan></p>
<br />
<p><span style=3D"font-weight: 400;">draft-ietf-roll-unaware-leaves:</span>=
</p>
<p><span style=3D"font-weight: 400;">Reviews on this draft are needed, Deci=
sion not to include MPL and Trickle consequences.</span></p>
<br />
<p><span style=3D"font-weight: 400;">draft-ietf-roll-nsa-extension :&nbsp;<=
/span></p>
<p><span style=3D"font-weight: 400;">This draft is pretty stable and no iss=
ues are known. Implementation is deployed. WGLC to be started after a coupl=
e of reviews.</span></p>
<p><span style=3D"font-weight: 400;">&nbsp;</span></p>
<p><span style=3D"font-weight: 400;">draft-rahul-roll-mop-ext:</span></p>
<p><span style=3D"font-weight: 400;">Draft will keep both MOP and CAP subje=
cts, use cases depend on both aspects. Dao-projection depends on this draft=
=2E Proposal for adoption is accepted.</span></p>
<br />
<p><span style=3D"font-weight: 400;">Draft-thubert-roll-turnon-rfc8138:</sp=
an></p>
<p><span style=3D"font-weight: 400;">No decision on this draft. For Peter, =
scope, purpose and relation to existing decision algorithms need to be clar=
ified.</span></p>
<br />
<p><span style=3D"font-weight: 400;">Discussion on ROLL-BIER:</span></p>
<p><span style=3D"font-weight: 400;">After several discussions the interest=
s of the authors have become much clearer. Due to changes in priorities the=
 Design&nbsp; Team is dissolved with thanks to Toerless. The multicast draf=
t by Carsten needs to place itself with respect to the Bier Roll protocols =
envisaged by Pascal.</span></p>
<br />
<p><span style=3D"font-weight: 400;">Charter:</span></p>
<p><span style=3D"font-weight: 400;">The aim is not to change the charter a=
nd steer with milestones.</span></p>
<br />
<div>-- <br />
<div class=3D"pre" style=3D"margin: 0; padding: 0; font-family: monospace">=
Peter van der Stok<br /> vanderstok consultancy<br /> mailto: <a href=3D"ma=
ilto:consultancy@vanderstok.org">consultancy@vanderstok.org</a>, <a href=3D=
"mailto:stokcons@bbhmail.nl">stokcons@bbhmail.nl</a><br /> www: <a href=3D"=
http://www.vanderstok.org" target=3D"_blank" rel=3D"noreferrer">www.vanders=
tok.org</a><br /> tel NL: +31(0)492474673 &nbsp;&nbsp;&nbsp;&nbsp;F: +33(0)=
966015248</div>
</div>
</body></html>

--=_055883ca410add3a04904695acb6e667--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Querying PDAO
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Subject: Re: [Roll] Querying PDAO
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Querying PDAO
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Subject: Re: [Roll] Querying PDAO
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Hello Michael:

I'd reward saying that DAO is the centralized way of doing what P2P RPL ach=
ieves in a distributed reactive fashion: a local DODAG that implements the =
concept of a 6TiSCH Track.
With the current spec the packets flow down the DODAG only, against the DOD=
AG orientation. The root the DODAG is the source of the packets, and the RP=
L classical forwarding apply for storing and non-storing. =20
The difference is in the control: there is no DIO messaging on the local DO=
DAG, and the DAO messaging is initiated by the main root as opposed to the =
distributed nodes.
If we need a return channel well need to introduce a DIO that would be floo=
ded the other way, or a DODAG in the other direction like AODV does.

So yes, P DAO installs routes, normally as different DODAGs typically as so=
urce-local RPL instances. The PCE may be hidden within or separated behind =
the main root, in which case the main root acts as proxy.
The expectation so far was that the request o establish a path would come f=
rom the application but the general DetNet model also enables the host to m=
ake that request.
With P DAO that means a message from the node to the root with a TSPEC that=
 allows the root to compute a constrained DODAG. Can be a DIS.

The DODAG is decomposed in linear segments that are installed separately us=
ing the PDAO messaging in a same local instance owned by the local root. We=
 probably need to explain all that a lot better.=20
RAW would be how we optimize the runtime of the projected DODAG.

All the best,

Pascal

> -----Original Message-----
> From: Roll <roll-bounces@ietf.org> On Behalf Of Michael Richardson
> Sent: jeudi 25 juillet 2019 11:38
> To: Routing Over Low power and Lossy networks <roll@ietf.org>
> Subject: Re: [Roll] Querying PDAO
>=20
>=20
> Li Zhao (liz3) <liz3@cisco.com> wrote:
>     > Correct. If the application on node X wants to ask a nearest path t=
o
>     > node Y, PDAO draft doesn't provide any mechanism.
>=20
> P2PRPL tries to do this, but you are suggesting that instead of learing i=
t, the
> root should just know it.  This goes to some of the PCE cases, I think.
>=20
> Is there PCE technology we can use?
>=20
> DAO-projection does not create a route that is remembered, rather it pref=
ixes
> it to a particular packet.  So you'd want node X to be able to ask the ro=
ot for
> such a source route?
>=20
>     > I think PDAO draft need to cover this case. Maybe how and when to u=
se
>     > PDAO is out of scope of this draft.
>     > But at least we need to reserve the asking capability and define th=
e
>     > protocol.
> --
> ]               Never tell me the odds!                 | ipv6 mesh netwo=
rks [
> ]   Michael Richardson, Sandelman Software Works        | network archite=
ct  [
> ]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails=
    [
>=20


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From: "Li Zhao (liz3)" <liz3@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] WGAdoption for draft-rahul-roll-mop-ext
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From: Michael Baddeley <michael.g.baddeley@gmail.com>
Date: Fri, 26 Jul 2019 07:41:20 +0100
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] stitching PDAO segments
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>
>
> A 6TiSCH tract is computed by a pce but with RPL the nodes do not care
> where that logical function is located and simply talk to the root. Either
> the root hosts a pce or it talks to a pce to get the computation done.
>
>
>
> Pascal,

Just to be clear for my own understanding: is a 6TiSCH track defined as
centrally computed by a PCE? I thought tracks could also be allocated with
soft cells in a distributed hop-by-hop manner? (for example, along the RPL
route).

Regards,


Michael

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<div dir=3D"ltr"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex"><div dir=3D"auto"><blockquote type=3D"cite"><div dir=3D"=
ltr"><div class=3D"gmail-m_-331505113703164544WordSection1"><div style=3D"b=
order-top:none;border-right:none;border-bottom:none;border-left:1.5pt solid=
 blue;padding:0mm 0mm 0mm 4pt"><div><p class=3D"MsoNormal"><br></p>
</div>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">A 6TiSCH tract is computed by a=
 pce but with RPL the nodes do not care where that logical function is loca=
ted and simply talk to the root. Either the root hosts a pce or it talks to=
 a pce to get the computation done.
<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0</span></p></div><=
/div></div></div></div></blockquote></div></blockquote><div>Pascal,=C2=A0</=
div><div><br></div><div>Just to be clear for my own understanding: is a 6Ti=
SCH track defined as centrally computed by a PCE? I thought tracks could al=
so be allocated with soft cells in a distributed hop-by-hop manner? (for ex=
ample, along the RPL route).</div><div><br></div><div>Regards,</div><div><b=
r></div><div><br></div><div>Michael</div></div></div>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] stitching PDAO segments
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Subject: Re: [Roll] stitching PDAO segments
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: Compressing the PDAO natively
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Subject: [Roll] Compressing the PDAO natively
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Dear all

This is hopefully the last item of the list of things we discussed at the g=
roup and need to follow up on.

At the time we wrote RFC 6550 we thought that compression was out of scope,=
 that we cared about the semantics, and that a 6LoWPAN thing would rapidly =
come and compress the RPL control plane packets.
We actually did RFC 8138 for the data plane, but the control plane work has=
 not started yet. So for PDAO, the question is, should we keep the RPL trad=
ition of uncompressed specs, or natively propose an RFC 8138 format for the=
 PDAO.

Having a native PDAO format would allow to copy paste the source route head=
er in non-storing PDAO. Would make the messages shorter. Would hint how to =
do the rest of the RPL control plane compression.
I'm willing to propose an update in that direction, would like to see feedb=
ack on the ML.

What do you all think?

Pascal

--_000_MN2PR11MB3565E133DA12559F333A78B8D8C00MN2PR11MB3565namp_
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<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This is hopefully the last item of the list of thing=
s we discussed at the group and need to follow up on.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">At the time we wrote RFC 6550 we thought that compre=
ssion was out of scope, that we cared about the semantics, and that a 6LoWP=
AN thing would rapidly come and compress the RPL control plane packets.<o:p=
></o:p></p>
<p class=3D"MsoNormal">We actually did RFC 8138 for the data plane, but the=
 control plane work has not started yet. So for PDAO, the question is, shou=
ld we keep the RPL tradition of uncompressed specs, or natively propose an =
RFC 8138 format for the PDAO.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Having a native PDAO format would allow to copy past=
e the source route header in non-storing PDAO. Would make the messages shor=
ter. Would hint how to do the rest of the RPL control plane compression.<o:=
p></o:p></p>
<p class=3D"MsoNormal">I&#8217;m willing to propose an update in that direc=
tion, would like to see feedback on the ML.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">What do you all think?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
</body>
</html>

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From: "Georgios Z. Papadopoulos" <georgios.papadopoulos@imt-atlantique.fr>
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Subject: Re: [Roll] Compressing the PDAO natively
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Hello Pascal,

As I said during the meeting, having RPL control plane compression would =
support the nsa-extention draft as well.
If there is room, I am willing to contribute.

Georgios

> On Jul 26, 2019, at 08:49, Pascal Thubert (pthubert) =
<pthubert@cisco.com> wrote:
>=20
> Dear all
> =20
> This is hopefully the last item of the list of things we discussed at =
the group and need to follow up on.
> =20
> At the time we wrote RFC 6550 we thought that compression was out of =
scope, that we cared about the semantics, and that a 6LoWPAN thing would =
rapidly come and compress the RPL control plane packets.
> We actually did RFC 8138 for the data plane, but the control plane =
work has not started yet. So for PDAO, the question is, should we keep =
the RPL tradition of uncompressed specs, or natively propose an RFC 8138 =
format for the PDAO.
> =20
> Having a native PDAO format would allow to copy paste the source route =
header in non-storing PDAO. Would make the messages shorter. Would hint =
how to do the rest of the RPL control plane compression.
> I=E2=80=99m willing to propose an update in that direction, would like =
to see feedback on the ML.
> =20
> What do you all think?
> =20
> Pascal
> _______________________________________________
> Roll mailing list
> Roll@ietf.org <mailto:Roll@ietf.org>
> https://www.ietf.org/mailman/listinfo/roll =
<https://www.ietf.org/mailman/listinfo/roll>

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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Hello Pascal,<div class=3D""><div class=3D""><br class=3D"">
</div><div class=3D"">As I said during the meeting, having RPL control =
plane compression would support the nsa-extention draft as =
well.</div><div class=3D"">If there is room, I am willing to =
contribute.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Georgios</div>
<br class=3D""><div><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jul 26, 2019, at 08:49, Pascal Thubert (pthubert) &lt;<a =
href=3D"mailto:pthubert@cisco.com" class=3D"">pthubert@cisco.com</a>&gt; =
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;"><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">Dear all<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">This is =
hopefully the last item of the list of things we discussed at the group =
and need to follow up on.<o:p class=3D""></o:p></div><div style=3D"margin:=
 0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">At the time we wrote RFC 6550 we thought that compression was =
out of scope, that we cared about the semantics, and that a 6LoWPAN =
thing would rapidly come and compress the RPL control plane packets.<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D"">We =
actually did RFC 8138 for the data plane, but the control plane work has =
not started yet. So for PDAO, the question is, should we keep the RPL =
tradition of uncompressed specs, or natively propose an RFC 8138 format =
for the PDAO.<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">Having a native PDAO format would allow to copy paste the =
source route header in non-storing PDAO. Would make the messages =
shorter. Would hint how to do the rest of the RPL control plane =
compression.<o:p class=3D""></o:p></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D"">I=E2=80=99m willing to propose an update in that direction, =
would like to see feedback on the ML.<o:p class=3D""></o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 11pt; font-family: =
Calibri, sans-serif;" class=3D"">What do you all think?<o:p =
class=3D""></o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
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widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; float: =
none; display: inline !important;" =
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href=3D"mailto:Roll@ietf.org" style=3D"color: rgb(149, 79, 114); =
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From: "Turner, Randy" <Randy.Turner@landisgyr.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Querying PDAO
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From: Michael Richardson <mcr@sandelman.ca>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Comments: In-reply-to "Pascal Thubert (pthubert)" <pthubert@cisco.com> message dated "Fri, 26 Jul 2019 12:49:00 -0000."
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Date: Fri, 26 Jul 2019 16:58:03 -0400
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Subject: Re: [Roll] Compressing the PDAO natively
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Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    > Having a native PDAO format would allow to copy paste the source route
    > header
    > in non-storing PDAO. Would make the messages shorter. Would hint how =
to do
    > the rest of the RPL control plane compression.

Interesting.

    > I=E2=80=99m willing to propose an update in that direction, would lik=
e to see
    > feedback on the ML.

    > What do you all think?

Years ago, I applied GHC to RPL control packets, and I got rather good
results.

--
]               Never tell me the odds!                 | ipv6 mesh network=
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]   Michael Richardson, Sandelman Software Works        | network architect=
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]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails  =
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From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Compressing the PDAO natively
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Rahul Arvind Jadhav <rahul.jadhav@huawei.com> wrote:
    > Hi Michael, Do you have the implementation anywhere? I would like to
    > experiment as well. Thanks

Yes, I have some code... finding it:

   https://github.com/mcr/roll-ghc



From nobody Sun Jul 28 02:11:33 2019
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On Jul 27, 2019, at 16:56, Michael Richardson <mcr@sandelman.ca> wrote:
>=20
>   https://github.com/mcr/roll-ghc

Nice =E2=80=94 82 LOC :-)
(No decompressor included, but that should be even smaller.)

Gr=C3=BC=C3=9Fe, Carsten


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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable


Carsten Bormann <cabo@tzi.org> wrote:
    > On Jul 27, 2019, at 16:56, Michael Richardson <mcr@sandelman.ca> wrot=
e:
    >>=20
    >> https://github.com/mcr/roll-ghc

    > Nice =E2=80=94 82 LOC :-) (No decompressor included, but that should =
be even
    > smaller.)

This went back to when some people wanted to produce "compressed" (abridged,
really) versions of RPL control messages.  I knew that would result in
devices that did not accept uncompressed messages, and major features would
be lost.=20

I think that this stupid 82LOC did better on the sample packets than the
abridged version did, and the discussion stopped.  And I didn't use the
compression contexts at all.

=2D-=20
]               Never tell me the odds!                 | ipv6 mesh network=
s [
]   Michael Richardson, Sandelman Software Works        |    IoT architect =
  [
]     mcr@sandelman.ca  http://www.sandelman.ca/        |   ruby on rails  =
  [



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Subject: [Roll] ROLL Minute IETF 105
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Dear all,

First of all MILLION THANKS to Dominique for being Minute taker and Michael
Richardson for being the Jabber Scribe :-)

Please find below the minute of IETF 105

https://datatracker.ietf.org/meeting/105/materials/minutes-105-roll-01.txt

Comments welcome before 2019-08-16 (Friday).

Thank you,

Ines and Peter

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<div dir=3D"ltr">Dear all,<div><br></div><div>First of all MILLION THANKS t=
o Dominique for being Minute taker and Michael Richardson for being the Jab=
ber Scribe :-)<br><div><br></div><div>Please find below the minute of IETF =
105</div><div><br></div><div><a href=3D"https://datatracker.ietf.org/meetin=
g/105/materials/minutes-105-roll-01.txt">https://datatracker.ietf.org/meeti=
ng/105/materials/minutes-105-roll-01.txt</a><br></div><div><br></div><div>C=
omments welcome before=C2=A02019-08-16 (Friday).</div></div><div><br></div>=
<div>Thank you,</div><div><br></div><div>Ines and Peter</div></div>

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From: Rahul Arvind Jadhav <rahul.jadhav@huawei.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: MOP value calculation with MOPex
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Subject: [Roll] MOP value calculation with MOPex
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Hello All,

During ROLL session, it was suggested that using "Final MOP =3D Base MOP + =
MOPex" may not be a good idea, since the implementation becomes more comple=
x.

My initial reasoning behind using such a scheme/calculation was to:

a.       Reuse all the values in base MOP. We do not lose a single value i.=
e., there is no MOP value reserved for extn. If base MOP value is 7 and if =
MOPex is absent then the final MOP is 7.

b.      When anyone references a MOP value X, it need not be referred to in=
 context to base MOP or extended MOP. For e.g., when we say MOP=3D11 ... th=
ere will be only one Mode of Operation it refers to and need not be specifi=
ed in the context of base or extended MOP.
Essentially we keep using the base MOP and add up from MOPex (if present) t=
o derive final MOP.

How will the implementation handle it?

1.       Process DIO base object and get the base MOP.

2.       Keep processing DIO Options and on encountering MOPex add the MOPe=
x value to the same var in step 1.

3.       At the end of DIO message processing check if the node supports MO=
P.
Section 3.2. makes it clear that if base MOP is 7 and MOPex is not present =
then the final MOP is 7.

Another way of handling this would be, If MOPex is present then ignore base=
 MOP and just use the value of MOPex as MOP. In this case we will lose out =
on 7 values of mop.
Please share your thoughts on this.

Regards,
Rahul

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<p class=3D"MsoNormal">Hello All,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">During ROLL session, it was suggested that using &#8=
220;Final MOP =3D Base MOP &#43; MOPex&#8221; may not be a good idea, since=
 the implementation becomes more complex.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">My initial reasoning behind using such a scheme/calc=
ulation was to:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">a.<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;
</span></span><![endif]>Reuse all the values in base MOP. We do not lose a =
single value i.e., there is no MOP value reserved for extn. If base MOP val=
ue is 7 and if MOPex is absent then the final MOP is 7.
<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">b.<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>When anyone references a MOP value X, it need not b=
e referred to in context to base MOP or extended MOP. For e.g., when we say=
 MOP=3D11 &#8230; there will be only one Mode of Operation it refers to and=
 need not be specified in the context of
 base or extended MOP.<o:p></o:p></p>
<p class=3D"MsoNormal">Essentially we keep using the base MOP and add up fr=
om MOPex (if present) to derive final MOP.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">How will the implementation handle it?<o:p></o:p></p=
>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">1.<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;
</span></span><![endif]>Process DIO base object and get the base MOP.<o:p><=
/o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">2.<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;
</span></span><![endif]>Keep processing DIO Options and on encountering MOP=
ex add the MOPex value to the same var in step 1.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">3.<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;
</span></span><![endif]>At the end of DIO message processing check if the n=
ode supports MOP.<o:p></o:p></p>
<p class=3D"MsoNormal">Section 3.2. makes it clear that if base MOP is 7 an=
d MOPex is not present then the final MOP is 7.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Another way of handling this would be, If MOPex is p=
resent then ignore base MOP and just use the value of MOPex as MOP. In this=
 case we will lose out on 7 values of mop.<o:p></o:p></p>
<p class=3D"MsoNormal">Please share your thoughts on this.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Rahul<o:p></o:p></p>
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