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From: Thomas Watteyne <thomas.watteyne@inria.fr>
Date: Wed, 6 Sep 2017 08:19:40 +0200
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Subject: [Roll] clarifying question about RPL: DAGMaxRankIncrease
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All,

While re-reading RFC6550 for the 10^6's time, and realize I have some
fundamental questions about DAGMaxRankIncrease...

In RFC6550, DAGMaxRankIncrease appears a grand total of 5 times (listed at
the bottom of this e-mail for pedantic completeness).

*Question 1: rationale*

The rationale of having DAGMaxRankIncrease is explained in the last
sentence below. But the sentence is not 100% clear, at least to me.

Do you agree with the statement that "DAGMaxRankIncrease is there to limit
the count-to-infinity"? That is, if parent and child and swapping roles,
rather than counting to infinity, they count to DAGMaxRankIncrease. To put
in another way, when a node's rank increases to L+DAGMaxRankIncrease, the
node has serious reasons to believe it is in a count-to-infinity spiral.

Please do comment if my comment is false!

*Question 2: recommended value*

Neither RFC6550, RFC8180 nor RFC6552 give any indication as to what value
to pick for DAGMaxRankIncrease.

I understand that, the larger the value of DAGMaxRankIncrease, the longer
the count-to-infinity spiral goes on. This means having packets reach their
hop limit, and get dropped. Bad.

The other extreme is to set DAGMaxRankIncrease=3DMinHopRankIncrease. This
results in a local repair as soon as the mote increases it rank to that of
its children.

It follows that the value of DAGMaxRankIncrease should be larger than
MinHopRankIncrease, but not too large so count-to-infinity aborts quickly.
OK.

But why should I have DAGMaxRankIncrease>MinHopRankIncrease at all? This
would allow count-to-infinity to start, and packets to get dropped, which
is a big no-no in serious networks. What is the danger of having
DAGMaxRankIncrease=3DMinHopRankIncrease?

Looking for inspiring insights.

Thomas

=3D=3D=3D=3D

Section 6.7.6:

MaxRankIncrease: 16-bit unsigned integer used to configure
DAGMaxRankIncrease, the allowable increase in Rank in support
of local repair. If DAGMaxRankIncrease is 0, then this
mechanism is disabled.

Section 8.2.24:

Let L be the lowest Rank within a DODAG Version that a given node
has advertised. Within the same DODAG Version, that node MUST
NOT advertise an effective Rank higher than L +
DAGMaxRankIncrease. INFINITE_RANK is an exception to this rule:
a node MAY advertise an INFINITE_RANK within a DODAG Version
without restriction. If a node=E2=80=99s Rank were to be higher than
allowed by L + DAGMaxRankIncrease, when it advertises Rank, it
MUST advertise its Rank as INFINITE_RANK.

Section 8.2.2.4:

A node is allowed to join any DODAG Version that it has never been a
prior member of without any restrictions, but if the node has been a
prior member of the DODAG Version, then it must continue to observe
the rule that it may not advertise a Rank higher than
L+DAGMaxRankIncrease at any point in the life of the DODAG Version.
This rule must be observed so as not to create a loophole that would
allow the node to effectively increment its Rank all the way to
INFINITE_RANK, which may have impact on other nodes and create a
resource-wasting count-to-infinity scenario.

--=20
_______________________________________

Thomas Watteyne, PhD
Research Scientist & Innovator, Inria
Sr Networking Design Eng, Linear Tech
Founder & co-lead, UC Berkeley OpenWSN
Co-chair, IETF 6TiSCH

www.thomaswatteyne.com
_______________________________________

--f40304361c2873712e05587f5538
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<div dir=3D"ltr">All,<div><br></div><div>While re-reading RFC6550 for the 1=
0^6&#39;s time, and realize I have some fundamental questions about=C2=A0<f=
ont face=3D"monospace, monospace">DAGMaxRankIncrease</font>...</div><div><b=
r></div><div>In RFC6550,=C2=A0<font face=3D"monospace, monospace">DAGMaxRan=
kIncrease</font>=C2=A0appears a grand total of 5 times (listed at the botto=
m of this e-mail for pedantic completeness).<br></div><div><br></div><div><=
u>Question 1: rationale</u></div><div><br></div><div>The rationale of havin=
g=C2=A0<span style=3D"font-family:monospace,monospace">DAGMaxRankIncrease</=
span>=C2=A0is explained in the <span style=3D"background-color:rgb(0,255,25=
5)">last sentence below</span>. But the sentence is not 100% clear, at leas=
t to me.</div><div><br></div><div>Do you agree with the statement that &quo=
t;<font face=3D"monospace, monospace">DAGMaxRankIncrease</font>=C2=A0is the=
re to limit the count-to-infinity&quot;? That is, if parent and child and s=
wapping roles, rather than counting to infinity, they count to=C2=A0<font f=
ace=3D"monospace, monospace">DAGMaxRankIncrease</font>. To put in another w=
ay, when a node&#39;s rank increases to <font face=3D"monospace, monospace"=
>L+DAGMaxRankIncrease</font>, the node has serious reasons to believe it is=
 in a count-to-infinity spiral.</div><div><br></div><div>Please do comment =
if my comment is false!</div><div><br></div><div><u>Question 2: recommended=
 value</u></div><div><br></div><div>Neither RFC6550, RFC8180 nor RFC6552 gi=
ve any indication as to what value to pick for=C2=A0<font face=3D"monospace=
, monospace">DAGMaxRankIncrease</font>.</div><div><br></div><div>I understa=
nd that, the larger the value of=C2=A0<font face=3D"monospace, monospace">D=
AGMaxRankIncrease</font>, the longer the count-to-infinity spiral goes on. =
This means having packets reach their hop limit, and get dropped. Bad.<br><=
/div><div><br></div><div>The other extreme is to set=C2=A0<font face=3D"mon=
ospace, monospace">DAGMaxRankIncrease=3DMinHopRankIncrease</font>. This res=
ults in a local repair as soon as the mote increases it rank to that of its=
 children.</div><div><br></div><div>It follows that the value of=C2=A0<span=
 style=3D"font-family:monospace,monospace">DAGMaxRankIncrease</span>=C2=A0s=
hould be larger than <font face=3D"monospace, monospace">MinHopRankIncrease=
</font>, but not too large so count-to-infinity aborts quickly. OK.</div><d=
iv><br></div><div>But why should I have=C2=A0<font face=3D"monospace, monos=
pace">DAGMaxRankIncrease&gt;MinHopRankIncrease</font> at all? This would al=
low count-to-infinity to start, and packets to get dropped, which is a big =
no-no in serious networks. What is the danger of having=C2=A0<span style=3D=
"font-family:monospace,monospace">DAGMaxRankIncrease=3DMinHopRankIncrease</=
span>?</div><div><br></div><div>Looking for inspiring insights.</div><div><=
br></div><div>Thomas</div><div><br></div><div>=3D=3D=3D=3D</div><div><br></=
div><div>Section 6.7.6:</div><div><br></div><div><div>MaxRankIncrease: 16-b=
it unsigned integer used to configure</div><div><span style=3D"background-c=
olor:rgb(255,255,0)">DAGMaxRankIncrease</span>, the allowable increase in R=
ank in support</div><div>of local repair. If <span style=3D"background-colo=
r:rgb(255,255,0)">DAGMaxRankIncrease </span>is 0, then this</div><div>mecha=
nism is disabled.</div></div><div><br></div><div>Section 8.2.24:</div><div>=
<br></div><div><div><font face=3D"monospace, monospace">Let L be the lowest=
 Rank within a DODAG Version that a given node</font></div><div><font face=
=3D"monospace, monospace">has advertised. Within the same DODAG Version, th=
at node MUST</font></div><div><font face=3D"monospace, monospace">NOT adver=
tise an effective Rank higher than L +</font></div><div><font face=3D"monos=
pace, monospace"><span style=3D"background-color:rgb(255,255,0)">DAGMaxRank=
Increase</span>. INFINITE_RANK is an exception to this rule:</font></div><d=
iv><font face=3D"monospace, monospace">a node MAY advertise an INFINITE_RAN=
K within a DODAG Version</font></div><div><font face=3D"monospace, monospac=
e">without restriction. If a node=E2=80=99s Rank were to be higher than</fo=
nt></div><div><font face=3D"monospace, monospace">allowed by L + <span styl=
e=3D"background-color:rgb(255,255,0)">DAGMaxRankIncrease</span>, when it ad=
vertises Rank, it</font></div><div><font face=3D"monospace, monospace">MUST=
 advertise its Rank as INFINITE_RANK.</font></div></div><div><br></div><div=
>Section <a href=3D"http://8.2.2.4">8.2.2.4</a>:</div><div><br></div><div><=
div><font face=3D"monospace, monospace">A node is allowed to join any DODAG=
 Version that it has never been a</font></div><div><font face=3D"monospace,=
 monospace">prior member of without any restrictions, but if the node has b=
een a</font></div><div><font face=3D"monospace, monospace">prior member of =
the DODAG Version, then it must continue to observe</font></div><div><font =
face=3D"monospace, monospace">the rule that it may not advertise a Rank hig=
her than</font></div><div><font face=3D"monospace, monospace">L+<span style=
=3D"background-color:rgb(255,255,0)">DAGMaxRankIncrease</span> at any point=
 in the life of the DODAG Version.</font></div><div><font face=3D"monospace=
, monospace"><span style=3D"background-color:rgb(0,255,255)">This rule must=
 be observed so as not to create a loophole that would</span></font></div><=
div><font face=3D"monospace, monospace"><span style=3D"background-color:rgb=
(0,255,255)">allow the node to effectively increment its Rank all the way t=
o</span></font></div><div><font face=3D"monospace, monospace"><span style=
=3D"background-color:rgb(0,255,255)">INFINITE_RANK, which may have impact o=
n other nodes and create a</span></font></div><div><font face=3D"monospace,=
 monospace"><span style=3D"background-color:rgb(0,255,255)">resource-wastin=
g count-to-infinity scenario.</span></font></div></div><div><div><br></div>=
-- <br><div class=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr=
"><div style=3D"font-size:small"><font face=3D"monospace, monospace">______=
_________________________________</font></div><div style=3D"font-size:small=
"><font face=3D"monospace, monospace"><br></font></div><div style=3D"font-s=
ize:small"><font face=3D"monospace, monospace">Thomas Watteyne, PhD</font><=
/div><div style=3D"font-size:small"><font face=3D"monospace, monospace">Res=
earch Scientist &amp; Innovator, Inria</font></div><div style=3D"font-size:=
small"><font face=3D"monospace, monospace">Sr Networking Design Eng, Linear=
 Tech</font></div><div style=3D"font-size:small"><font face=3D"monospace, m=
onospace">Founder &amp; co-lead, UC Berkeley OpenWSN</font></div><div style=
=3D"font-size:small"><font face=3D"monospace, monospace">Co-chair, IETF 6Ti=
SCH</font></div><div style=3D"font-size:small"><font face=3D"monospace, mon=
ospace"><br></font></div><div style=3D"font-size:small"><font face=3D"monos=
pace, monospace"><a href=3D"http://www.thomaswatteyne.com" target=3D"_blank=
">www.thomaswatteyne.com</a></font></div><div style=3D"font-size:small"><fo=
nt face=3D"monospace, monospace">_______________________________________</f=
ont></div></div></div></div></div>
</div></div>

--f40304361c2873712e05587f5538--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Thomas Watteyne <thomas.watteyne@inria.fr>, IETF ROLL <roll@ietf.org>, "6tisch@ietf.org" <6tisch@ietf.org>
Thread-Topic: [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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From: Xavi Vilajosana Guillen <xvilajosana@uoc.edu>
Date: Wed, 6 Sep 2017 15:32:08 +0200
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: Thomas Watteyne <thomas.watteyne@inria.fr>, IETF ROLL <roll@ietf.org>,  "6tisch@ietf.org" <6tisch@ietf.org>
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Subject: Re: [Roll] [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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Hi,

I have a clarifying question.

when a node uses DAGMaxRankIncrease =3D 0, this means that this mechanism i=
s
disabled. What that really means? is then L the rank a node should
advertise?

regards,
Xavi


2017-09-06 14:02 GMT+02:00 Pascal Thubert (pthubert) <pthubert@cisco.com>:

>
>
>
>
> *From:* 6tisch [mailto:6tisch-bounces@ietf.org] *On Behalf Of *Thomas
> Watteyne
> *Sent:* mercredi 6 septembre 2017 08:20
> *To:* IETF ROLL <roll@ietf.org>; 6tisch@ietf.org
> *Subject:* [6tisch] clarifying question about RPL: DAGMaxRankIncrease
>
>
>
> All,
>
>
>
> While re-reading RFC6550 for the 10^6's time, and realize I have some
> fundamental questions about DAGMaxRankIncrease...
>
>
>
> In RFC6550, DAGMaxRankIncrease appears a grand total of 5 times (listed
> at the bottom of this e-mail for pedantic completeness).
>
>
>
> *Question 1: rationale*
>
>
>
> The rationale of having DAGMaxRankIncrease is explained in the last
> sentence below. But the sentence is not 100% clear, at least to me.
>
>
>
> Do you agree with the statement that "DAGMaxRankIncrease is there to
> limit the count-to-infinity"?
>
> *[Pascal] YES*
>
> That is, if parent and child and swapping roles, rather than counting to
> infinity, they count to DAGMaxRankIncrease. To put in another way, when a
> node's rank increases to L+DAGMaxRankIncrease, the node has serious
> reasons to believe it is in a count-to-infinity spiral.
>
> *[Pascal] YES*
>
>
>
> Please do comment if my comment is false!
>
> *[Pascal] No comment : )*
>
>
>
> *Question 2: recommended value*
>
>
>
> Neither RFC6550, RFC8180 nor RFC6552 give any indication as to what value
> to pick for DAGMaxRankIncrease.
>
> *[Pascal] I=E2=80=99d suggest 0; this relates to the chances of picking a=
 child of
> yours in a down spiral. If you=E2=80=99re lucky, you pick a parent below =
you that
> is not your descendant and the method succeeds. If you are unlucky, you a=
re
> one of his ancestors and a loop is created. If he has multiple parents,
> only some of the packets may be affected. IOW: You are lucky and local
> repair is really quick. You are unlucky and it is really long. You have a=
n
> external hint, good for you. You don=E2=80=99t and you expect a determini=
stic
> behavior, do not use that scheme. Note: these comments come from someone
> who opposed that mechanism in the RPL design. *
>
>
>
> I understand that, the larger the value of DAGMaxRankIncrease, the longer
> the count-to-infinity spiral goes on. This means having packets reach the=
ir
> hop limit, and get dropped. Bad.
>
>
>
> *[Pascal] True*
>
>
>
> The other extreme is to set DAGMaxRankIncrease=3DMinHopRankIncrease. This
> results in a local repair as soon as the mote increases it rank to that o=
f
> its children.
>
> *[Pascal] True, one may attach to an ex-sibling. That should be mostly
> harmless since it does not break the feasibility condition, which is, do
> not attach to someone that advertises a Rank worse than you ever advertis=
ed
> (since you last poisoned), expressed in units of MinHopRankIncrease.*
>
>
>
>
>
> It follows that the value of DAGMaxRankIncrease should be larger than
> MinHopRankIncrease, but not too large so count-to-infinity aborts
> quickly. OK.
>
> *[Pascal] No. You do not have to use the mechanism at all (or use it as
> above)*
>
>
>
> But why should I have DAGMaxRankIncrease>MinHopRankIncrease at all? This
> would allow count-to-infinity to start, and packets to get dropped, which
> is a big no-no in serious networks. What is the danger of having
> DAGMaxRankIncrease=3DMinHopRankIncrease?
>
> *[Pascal] Agreed. I=E2=80=99m still looking for the piece that you dod no=
t
> understand. I do not see any=E2=80=A6*
>

>
> Looking for inspiring insights.
>
> *[Pascal] http://www.inspiringinsights.nl/
> <http://www.inspiringinsights.nl/> (but I do not understand a word myself=
 ;
> )*
>
>
>
> *Take care,*
>
>
>
> *Pascal*
>
>
>
>
>
> Thomas
>
>
>
> =3D=3D=3D=3D
>
>
>
> Section 6.7.6:
>
>
>
> MaxRankIncrease: 16-bit unsigned integer used to configure
>
> DAGMaxRankIncrease, the allowable increase in Rank in support
>
> of local repair. If DAGMaxRankIncrease is 0, then this
>
> mechanism is disabled.
>
>
>
> Section 8.2.24:
>
>
>
> Let L be the lowest Rank within a DODAG Version that a given node
>
> has advertised. Within the same DODAG Version, that node MUST
>
> NOT advertise an effective Rank higher than L +
>
> DAGMaxRankIncrease. INFINITE_RANK is an exception to this rule:
>
> a node MAY advertise an INFINITE_RANK within a DODAG Version
>
> without restriction. If a node=E2=80=99s Rank were to be higher than
>
> allowed by L + DAGMaxRankIncrease, when it advertises Rank, it
>
> MUST advertise its Rank as INFINITE_RANK.
>
>
>
> Section 8.2.2.4:
>
>
>
> A node is allowed to join any DODAG Version that it has never been a
>
> prior member of without any restrictions, but if the node has been a
>
> prior member of the DODAG Version, then it must continue to observe
>
> the rule that it may not advertise a Rank higher than
>
> L+DAGMaxRankIncrease at any point in the life of the DODAG Version.
>
> This rule must be observed so as not to create a loophole that would
>
> allow the node to effectively increment its Rank all the way to
>
> INFINITE_RANK, which may have impact on other nodes and create a
>
> resource-wasting count-to-infinity scenario.
>
>
>
> --
>
> _______________________________________
>
>
>
> Thomas Watteyne, PhD
>
> Research Scientist & Innovator, Inria
>
> Sr Networking Design Eng, Linear Tech
>
> Founder & co-lead, UC Berkeley OpenWSN
>
> Co-chair, IETF 6TiSCH
>
>
>
> www.thomaswatteyne.com
>
> _______________________________________
>
> _______________________________________________
> 6tisch mailing list
> 6tisch@ietf.org
> https://www.ietf.org/mailman/listinfo/6tisch
>
>


--=20
Dr. Xavier Vilajosana
Wireless Networks Lab

*Internet Interdisciplinary Institute (IN3)Professor*
(+34) 646 633 681
xvilajosana@uoc.edu <usuari@uoc.edu>
http://xvilajosana.org
http://wine.rdi.uoc.edu
Parc Mediterrani de la Tecnologia
Av Carl Friedrich Gauss 5, B3 Building
08860 Castelldefels (Barcelona). Catalonia. Spain
[image: Universitat Oberta de Catalunya]
=C2=AD

--94eb2c08d858dc4cae0558855efa
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi,<div><br></div><div>I have a clarifying question.</div>=
<div><br></div><div>when a node uses=C2=A0<span style=3D"color:rgb(0,0,0);f=
ont-size:13.3333px">DAGMaxRankIncrease =3D 0, this means that this mechanis=
m is disabled. What that really means? is then L the rank a node should adv=
ertise?=C2=A0</span></div><div><br></div><div>regards,</div><div>Xavi</div>=
<div><br></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">20=
17-09-06 14:02 GMT+02:00 Pascal Thubert (pthubert) <span dir=3D"ltr">&lt;<a=
 href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthubert@cisco.com</a=
>&gt;</span>:<br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px =
0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_184725228087612689WordSection1">
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:11pt;font-famil=
y:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:11pt;font-famil=
y:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><b><span style=3D"font-si=
ze:11pt;font-family:Calibri,sans-serif">From:</span></b><span style=3D"font=
-size:11pt;font-family:Calibri,sans-serif"> 6tisch [mailto:<a href=3D"mailt=
o:6tisch-bounces@ietf.org" target=3D"_blank">6tisch-bounces@ietf.<wbr>org</=
a>]
<b>On Behalf Of </b>Thomas Watteyne<br>
<b>Sent:</b> mercredi 6 septembre 2017 08:20<br>
<b>To:</b> IETF ROLL &lt;<a href=3D"mailto:roll@ietf.org" target=3D"_blank"=
>roll@ietf.org</a>&gt;; <a href=3D"mailto:6tisch@ietf.org" target=3D"_blank=
">6tisch@ietf.org</a><br>
<b>Subject:</b> [6tisch] clarifying question about RPL: DAGMaxRankIncrease<=
u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">All,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">While re-reading RFC6550 =
for the 10^6&#39;s time, and realize I have some fundamental questions abou=
t=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrea=
se</span>...<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">In RFC6550,=C2=A0<span st=
yle=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrease</span>=C2=A0=
<wbr>appears a grand total of 5 times (listed at the bottom of this e-mail =
for pedantic completeness).<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u>Question 1: rationale<=
/u><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">The rationale of having=
=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncreas=
e</span>=C2=A0is explained in the
<span style=3D"background:aqua">last sentence below</span>. But the sentenc=
e is not 100% clear, at least to me.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
</span><div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Do you agree with the sta=
tement that &quot;<span style=3D"font-family:&quot;Courier New&quot;">DAGMa=
xRankIncrease</span>=C2=A0is there to limit the count-to-infinity&quot;?
<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] YES<u></u><u></u></spa=
n></i></b></p><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">That is, if parent and ch=
ild and swapping roles, rather than counting to infinity, they count to=C2=
=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrease</=
span>. To put in another way, when a node&#39;s rank increases
 to <span style=3D"font-family:&quot;Courier New&quot;">L+DAGMaxRankIncreas=
e</span>, the node has serious reasons to believe it is in a count-to-infin=
ity spiral.<u></u><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] YES</span></i></b><spa=
n style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,12=
5)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Please do comment if my c=
omment is false!<u></u><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] No comment : )</span><=
/i></b><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:r=
gb(31,73,125)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u>Question 2: recommende=
d value</u><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Neither RFC6550, RFC8180 =
nor RFC6552 give any indication as to what value to pick for=C2=A0<span sty=
le=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrease</span>.<u></u=
><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] I=E2=80=99d suggest 0;=
 this relates to the chances of picking a child of yours in a down spiral. =
If you=E2=80=99re lucky, you pick a parent below you that is not
 your descendant and the method succeeds. If you are unlucky, you are one o=
f his ancestors and a loop is created. If he has multiple parents, only som=
e of the packets may be affected. IOW: You are lucky and local repair is re=
ally quick. You are unlucky and
 it is really long. You have an external hint, good for you. You don=E2=80=
=99t and you expect a deterministic behavior, do not use that scheme. Note:=
 these comments come from someone who opposed that mechanism in the RPL des=
ign.
</span></i></b><span style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)"><u></u><u></u></span></p>
</div><span class=3D"gmail-">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">I understand that, the la=
rger the value of=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">=
DAGMaxRankIncrease</span>, the longer the count-to-infinity spiral goes on.=
 This means having packets reach their hop limit, and
 get dropped. Bad.<u></u><u></u></p>
</div>
</span><div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"color:rgb(=
31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">[Pascal] True<u></u><u></u></span></i>=
</b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">The other extreme is to s=
et=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncre=
ase=3D<wbr>MinHopRankIncrease</span>. This results in a local repair as soo=
n as the mote increases it rank to that of its children.<u></u><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] True, one may attach t=
o an ex-sibling. That should be mostly harmless since it does not break the=
 feasibility condition, which is, do not attach
 to someone that advertises a Rank worse than you ever advertised (since yo=
u last poisoned), expressed in units of MinHopRankIncrease.<u></u><u></u></=
span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">It follows that the value=
 of=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncr=
ease</span>=C2=A0should be larger than
<span style=3D"font-family:&quot;Courier New&quot;">MinHopRankIncrease</spa=
n>, but not too large so count-to-infinity aborts quickly. OK.<u></u><u></u=
></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] No. You do not have to=
 use the mechanism at all (or use it as above)</span></i></b><span style=3D=
"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u=
><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">But why should I have=C2=
=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrease&g=
t;<wbr>MinHopRankIncrease</span> at all? This would allow count-to-infinity=
 to start, and packets to get dropped, which is a big no-no
 in serious networks. What is the danger of having=C2=A0<span style=3D"font=
-family:&quot;Courier New&quot;">DAGMaxRankIncrease=3D<wbr>MinHopRankIncrea=
se</span>?<u></u><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] Agreed. I=E2=80=99m st=
ill looking for the piece that you dod not understand. I do not see any=E2=
=80=A6</span></i></b></p></div></div></div></div></blockquote><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"gmai=
l-m_184725228087612689WordSection1"><div><div><p class=3D"MsoNormal"><span =
style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)=
"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Looking for inspiring ins=
ights.<u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">[Pascal]
<a href=3D"http://www.inspiringinsights.nl/" target=3D"_blank">http://www.i=
nspiringinsights.<wbr>nl/</a> (but I do not understand a word myself ; )<u>=
</u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></i></b></p=
>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">Take care,<span class=3D"gmail-HOEnZb"=
><font color=3D"#888888"><u></u><u></u></font></span></span></i></b></p><sp=
an class=3D"gmail-HOEnZb"><font color=3D"#888888">
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></i></b></p=
>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">Pascal<u></u><u></u></span></i></b></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
</font></span></div><div><div class=3D"gmail-h5">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Thomas<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">=3D=3D=3D=3D<u></u><u></u=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Section 6.7.6:<u></u><u><=
/u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">MaxRankIncrease: 16-bit u=
nsigned integer used to configure<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"background=
:yellow">DAGMaxRankIncrease</span>, the allowable increase in Rank in suppo=
rt<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">of local repair. If <span=
 style=3D"background:yellow">
DAGMaxRankIncrease </span>is 0, then this<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">mechanism is disabled.<u>=
</u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Section 8.2.24:<u></u><u>=
</u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Let L be the lowest Rank within a DODAG Version =
that a given node</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">has advertised. Within the same DODAG Version, t=
hat node MUST</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">NOT advertise an effective Rank higher than L +<=
/span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:yellow">DAGMaxRankIncrease</span><span=
 style=3D"font-family:&quot;Courier New&quot;">. INFINITE_RANK is an except=
ion to this rule:</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">a node MAY advertise an INFINITE_RANK within a D=
ODAG Version</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">without restriction. If a node=E2=80=99s Rank we=
re to be higher than</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">allowed by L +
<span style=3D"background:yellow">DAGMaxRankIncrease</span>, when it advert=
ises Rank, it</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">MUST advertise its Rank as INFINITE_RANK.</span>=
<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Section <a href=3D"http:/=
/8.2.2.4" target=3D"_blank">
8.2.2.4</a>:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">A node is allowed to join any DODAG Version that=
 it has never been a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">prior member of without any restrictions, but if=
 the node has been a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">prior member of the DODAG Version, then it must =
continue to observe</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">the rule that it may not advertise a Rank higher=
 than</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">L+<span style=3D"background:yellow">DAGMaxRankIn=
crease</span> at any point in the life of the DODAG Version.</span><u></u><=
u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:aqua">This rule must be observed so as=
 not to create a loophole that would</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:aqua">allow the node to effectively in=
crement its Rank all the way to</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:aqua">INFINITE_RANK, which may have im=
pact on other nodes and create a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:aqua">resource-wasting count-to-infini=
ty scenario.</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">-- <u></u><u></u></p>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">______________________________<wbr>_________</sp=
an><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Thomas Watteyne, PhD</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Research Scientist &amp; Innovator, Inria</span>=
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Sr Networking Design Eng, Linear Tech</span><u><=
/u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Founder &amp; co-lead, UC Berkeley OpenWSN</span=
><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Co-chair, IETF 6TiSCH</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;"><a href=3D"http://www.thomaswatteyne.com" target=
=3D"_blank">www.thomaswatteyne.com</a></span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">______________________________<wbr>_________</sp=
an><u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div></div></div>
</div>
</div>

<br>______________________________<wbr>_________________<br>
6tisch mailing list<br>
<a href=3D"mailto:6tisch@ietf.org">6tisch@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/6tisch" rel=3D"noreferrer"=
 target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/6tisch</a><br=
>
<br></blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div cla=
ss=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div dir=3D"l=
tr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div><table width=3D=
"200" border=3D"0" cellspacing=3D"0" cellpadding=3D"0" style=3D"color:rgb(0=
,0,0);font-family:Arial,sans-serif;font-size:0.875em;line-height:1.25em"><t=
body><tr><td align=3D"left" valign=3D"top" style=3D"border-top:3px solid rg=
b(115,237,255);padding-top:3px;color:rgb(0,0,120)"><span style=3D"font-weig=
ht:bold">Dr. Xavier Vilajosana</span><br>Wireless Networks Lab<br><i>Intern=
et Interdisciplinary Institute (IN3)<br>Professor</i><br>(+34) 646 633 681<=
br>xvilajosana<a href=3D"mailto:usuari@uoc.edu" style=3D"color:rgb(0,0,120)=
" target=3D"_blank">@uoc.edu</a><br><a href=3D"http://xvilajosana.org" targ=
et=3D"_blank">http://xvilajosana.org</a><br><a href=3D"http://wine.rdi.uoc.=
edu" target=3D"_blank">http://wine.rdi.uoc.edu</a><br></td></tr><tr><td ali=
gn=3D"left" valign=3D"top" style=3D"border-top:3px solid rgb(115,237,255);p=
adding-top:3px;color:rgb(0,0,120)">Parc Mediterrani de la Tecnologia=C2=A0<=
br>Av Carl Friedrich Gauss 5, B3 Building<br>08860 Castelldefels (Barcelona=
). Catalonia. Spain</td></tr></tbody></table></div><div><div dir=3D"ltr" st=
yle=3D"font-size:12.8px"><font color=3D"#4d4d4d" face=3D"Verdana, Tahoma"><=
div dir=3D"ltr"><img src=3D"https://cv.uoc.edu/WebMail/resources/img/UOC_e_=
mail.gif" alt=3D"Universitat Oberta de Catalunya" style=3D"color: rgb(0, 0,=
 0); font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 10px; b=
order: none;"><span style=3D"font-size:12.8px;font-family:arial,sans-serif;=
color:rgb(34,34,34)">=C2=A0=C2=A0</span><img src=3D"https://ferranadelantad=
o.files.wordpress.com/2014/05/wine_logo_small2-e1453363995864.png?w=3D330&a=
mp;h=3D123" style=3D"color: rgb(0, 0, 0); font-family: Verdana, Arial, Helv=
etica, sans-serif; font-size: 10px;" width=3D"96" height=3D"35"><br></div><=
/font></div></div><div><span>=C2=AD</span></div></div></div></div></div></d=
iv></div></div></div>
</div></div>

--94eb2c08d858dc4cae0558855efa--


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From: Thomas Watteyne <thomas.watteyne@inria.fr>
Date: Wed, 6 Sep 2017 15:36:22 +0200
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Subject: Re: [Roll] [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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On Wed, Sep 6, 2017 at 2:02 PM, Pascal Thubert (pthubert) <
pthubert@cisco.com> wrote:

>
>
>
>
> *From:* 6tisch [mailto:6tisch-bounces@ietf.org] *On Behalf Of *Thomas
> Watteyne
> *Sent:* mercredi 6 septembre 2017 08:20
> *To:* IETF ROLL <roll@ietf.org>; 6tisch@ietf.org
> *Subject:* [6tisch] clarifying question about RPL: DAGMaxRankIncrease
>
>
>
> All,
>
>
>
> While re-reading RFC6550 for the 10^6's time, and realize I have some
> fundamental questions about DAGMaxRankIncrease...
>
>
>
> In RFC6550, DAGMaxRankIncrease appears a grand total of 5 times (listed
> at the bottom of this e-mail for pedantic completeness).
>
>
>
> *Question 1: rationale*
>
>
>
> The rationale of having DAGMaxRankIncrease is explained in the last
> sentence below. But the sentence is not 100% clear, at least to me.
>
>
>
> Do you agree with the statement that "DAGMaxRankIncrease is there to
> limit the count-to-infinity"?
>
> *[Pascal] YES*
>
> That is, if parent and child and swapping roles, rather than counting to
> infinity, they count to DAGMaxRankIncrease. To put in another way, when a
> node's rank increases to L+DAGMaxRankIncrease, the node has serious
> reasons to believe it is in a count-to-infinity spiral.
>
> *[Pascal] YES*
>
>
>
> Please do comment if my comment is false!
>
> *[Pascal] No comment : )*
>
>
>
> *Question 2: recommended value*
>
>
>
> Neither RFC6550, RFC8180 nor RFC6552 give any indication as to what value
> to pick for DAGMaxRankIncrease.
>
> *[Pascal] I=E2=80=99d suggest 0; this relates to the chances of picking a=
 child of
> yours in a down spiral. If you=E2=80=99re lucky, you pick a parent below =
you that
> is not your descendant and the method succeeds. If you are unlucky, you a=
re
> one of his ancestors and a loop is created. If he has multiple parents,
> only some of the packets may be affected. IOW: You are lucky and local
> repair is really quick. You are unlucky and it is really long. You have a=
n
> external hint, good for you. You don=E2=80=99t and you expect a determini=
stic
> behavior, do not use that scheme. Note: these comments come from someone
> who opposed that mechanism in the RPL design.*
>

I have a hard time following. Setting DAGMaxRankIncrease to 0 means you
disable the bounding on the count-to-infinity, and you run the risk of
having an actual count to infinity. Is that what you suggest?


>
>
> I understand that, the larger the value of DAGMaxRankIncrease, the longer
> the count-to-infinity spiral goes on. This means having packets reach the=
ir
> hop limit, and get dropped. Bad.
>
>
>
> *[Pascal] True*
>
>
>
> The other extreme is to set DAGMaxRankIncrease=3DMinHopRankIncrease. This
> results in a local repair as soon as the mote increases it rank to that o=
f
> its children.
>
> *[Pascal] True, one may attach to an ex-sibling. That should be mostly
> harmless since it does not break the feasibility condition, which is, do
> not attach to someone that advertises a Rank worse than you ever advertis=
ed
> (since you last poisoned), expressed in units of MinHopRankIncrease.*
>
>
>
>
>
> It follows that the value of DAGMaxRankIncrease should be larger than
> MinHopRankIncrease, but not too large so count-to-infinity aborts
> quickly. OK.
>
> *[Pascal] No. You do not have to use the mechanism at all (or use it as
> above)*
>
>
>
> But why should I have DAGMaxRankIncrease>MinHopRankIncrease at all? This
> would allow count-to-infinity to start, and packets to get dropped, which
> is a big no-no in serious networks. What is the danger of having
> DAGMaxRankIncrease=3DMinHopRankIncrease?
>
> *[Pascal] Agreed. I=E2=80=99m still looking for the piece that you dod no=
t
> understand. I do not see any=E2=80=A6*
>
>
>
> Looking for inspiring insights.
>
> *[Pascal] http://www.inspiringinsights.nl/
> <http://www.inspiringinsights.nl/> (but I do not understand a word myself=
 ;
> )*
>

:-)


>
>
> *Take care,*
>
>
>
> *Pascal*
>
>
>
>
>
> Thomas
>
>
>
> =3D=3D=3D=3D
>
>
>
> Section 6.7.6:
>
>
>
> MaxRankIncrease: 16-bit unsigned integer used to configure
>
> DAGMaxRankIncrease, the allowable increase in Rank in support
>
> of local repair. If DAGMaxRankIncrease is 0, then this
>
> mechanism is disabled.
>
>
>
> Section 8.2.24:
>
>
>
> Let L be the lowest Rank within a DODAG Version that a given node
>
> has advertised. Within the same DODAG Version, that node MUST
>
> NOT advertise an effective Rank higher than L +
>
> DAGMaxRankIncrease. INFINITE_RANK is an exception to this rule:
>
> a node MAY advertise an INFINITE_RANK within a DODAG Version
>
> without restriction. If a node=E2=80=99s Rank were to be higher than
>
> allowed by L + DAGMaxRankIncrease, when it advertises Rank, it
>
> MUST advertise its Rank as INFINITE_RANK.
>
>
>
> Section 8.2.2.4:
>
>
>
> A node is allowed to join any DODAG Version that it has never been a
>
> prior member of without any restrictions, but if the node has been a
>
> prior member of the DODAG Version, then it must continue to observe
>
> the rule that it may not advertise a Rank higher than
>
> L+DAGMaxRankIncrease at any point in the life of the DODAG Version.
>
> This rule must be observed so as not to create a loophole that would
>
> allow the node to effectively increment its Rank all the way to
>
> INFINITE_RANK, which may have impact on other nodes and create a
>
> resource-wasting count-to-infinity scenario.
>
>
>
> --
>
> _______________________________________
>
>
>
> Thomas Watteyne, PhD
>
> Research Scientist & Innovator, Inria
>
> Sr Networking Design Eng, Linear Tech
>
> Founder & co-lead, UC Berkeley OpenWSN
>
> Co-chair, IETF 6TiSCH
>
>
>
> www.thomaswatteyne.com
>
> _______________________________________
>



--=20
_______________________________________

Thomas Watteyne, PhD
Research Scientist & Innovator, Inria
Sr Networking Design Eng, Linear Tech
Founder & co-lead, UC Berkeley OpenWSN
Co-chair, IETF 6TiSCH

www.thomaswatteyne.com
_______________________________________

--f403043790402fa7870558856fcd
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">inline<div class=3D"gmail_extra"><br><div class=3D"gmail_q=
uote">On Wed, Sep 6, 2017 at 2:02 PM, Pascal Thubert (pthubert) <span dir=
=3D"ltr">&lt;<a href=3D"mailto:pthubert@cisco.com" target=3D"_blank">pthube=
rt@cisco.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddi=
ng-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_57213528153279530WordSection1">
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:11pt;font-famil=
y:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:11pt;font-famil=
y:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><b><span style=3D"font-si=
ze:11pt;font-family:Calibri,sans-serif">From:</span></b><span style=3D"font=
-size:11pt;font-family:Calibri,sans-serif"> 6tisch [mailto:<a href=3D"mailt=
o:6tisch-bounces@ietf.org" target=3D"_blank">6tisch-bounces@ietf.<wbr>org</=
a>]
<b>On Behalf Of </b>Thomas Watteyne<br>
<b>Sent:</b> mercredi 6 septembre 2017 08:20<br>
<b>To:</b> IETF ROLL &lt;<a href=3D"mailto:roll@ietf.org" target=3D"_blank"=
>roll@ietf.org</a>&gt;; <a href=3D"mailto:6tisch@ietf.org" target=3D"_blank=
">6tisch@ietf.org</a><br>
<b>Subject:</b> [6tisch] clarifying question about RPL: DAGMaxRankIncrease<=
u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">All,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">While re-reading RFC6550 =
for the 10^6&#39;s time, and realize I have some fundamental questions abou=
t=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrea=
se</span>...<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">In RFC6550,=C2=A0<span st=
yle=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrease</span>=C2=A0=
<wbr>appears a grand total of 5 times (listed at the bottom of this e-mail =
for pedantic completeness).<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u>Question 1: rationale<=
/u><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">The rationale of having=
=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncreas=
e</span>=C2=A0is explained in the
<span style=3D"background:aqua">last sentence below</span>. But the sentenc=
e is not 100% clear, at least to me.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
</span><div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Do you agree with the sta=
tement that &quot;<span style=3D"font-family:&quot;Courier New&quot;">DAGMa=
xRankIncrease</span>=C2=A0is there to limit the count-to-infinity&quot;?
<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] YES<u></u><u></u></spa=
n></i></b></p><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">That is, if parent and ch=
ild and swapping roles, rather than counting to infinity, they count to=C2=
=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrease</=
span>. To put in another way, when a node&#39;s rank increases
 to <span style=3D"font-family:&quot;Courier New&quot;">L+DAGMaxRankIncreas=
e</span>, the node has serious reasons to believe it is in a count-to-infin=
ity spiral.<u></u><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] YES</span></i></b><spa=
n style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,12=
5)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Please do comment if my c=
omment is false!<u></u><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] No comment : )</span><=
/i></b><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:r=
gb(31,73,125)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u>Question 2: recommende=
d value</u><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Neither RFC6550, RFC8180 =
nor RFC6552 give any indication as to what value to pick for=C2=A0<span sty=
le=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrease</span>.<u></u=
><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] I=E2=80=99d suggest 0;=
 this relates to the chances of picking a child of yours in a down spiral. =
If you=E2=80=99re lucky, you pick a parent below you that is not
 your descendant and the method succeeds. If you are unlucky, you are one o=
f his ancestors and a loop is created. If he has multiple parents, only som=
e of the packets may be affected. IOW: You are lucky and local repair is re=
ally quick. You are unlucky and
 it is really long. You have an external hint, good for you. You don=E2=80=
=99t and you expect a deterministic behavior, do not use that scheme. Note:=
 these comments come from someone who opposed that mechanism in the RPL des=
ign.</span></i></b></p></div></div></div></div></blockquote><div><br></div>=
<div>I have a hard time following. Setting=C2=A0DAGMaxRankIncrease to 0 mea=
ns you disable the bounding on the count-to-infinity, and you run the risk =
of having an actual count to infinity. Is that what you suggest?</div><div>=
=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"=
EN-US"><div class=3D"gmail-m_57213528153279530WordSection1"><div><div><p cl=
ass=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Calibri,s=
ans-serif;color:rgb(31,73,125)">
</span></i></b><span style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)"><u></u><u></u></span></p>
</div><span class=3D"gmail-">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">I understand that, the la=
rger the value of=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">=
DAGMaxRankIncrease</span>, the longer the count-to-infinity spiral goes on.=
 This means having packets reach their hop limit, and
 get dropped. Bad.<u></u><u></u></p>
</div>
</span><div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"color:rgb(=
31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">[Pascal] True<u></u><u></u></span></i>=
</b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">The other extreme is to s=
et=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncre=
ase=3D<wbr>MinHopRankIncrease</span>. This results in a local repair as soo=
n as the mote increases it rank to that of its children.<u></u><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] True, one may attach t=
o an ex-sibling. That should be mostly harmless since it does not break the=
 feasibility condition, which is, do not attach
 to someone that advertises a Rank worse than you ever advertised (since yo=
u last poisoned), expressed in units of MinHopRankIncrease.<u></u><u></u></=
span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">It follows that the value=
 of=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncr=
ease</span>=C2=A0should be larger than
<span style=3D"font-family:&quot;Courier New&quot;">MinHopRankIncrease</spa=
n>, but not too large so count-to-infinity aborts quickly. OK.<u></u><u></u=
></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] No. You do not have to=
 use the mechanism at all (or use it as above)</span></i></b><span style=3D=
"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u=
><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div><span class=3D"gmail-">
<p class=3D"MsoNormal" style=3D"margin-left:36pt">But why should I have=C2=
=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrease&g=
t;<wbr>MinHopRankIncrease</span> at all? This would allow count-to-infinity=
 to start, and packets to get dropped, which is a big no-no
 in serious networks. What is the danger of having=C2=A0<span style=3D"font=
-family:&quot;Courier New&quot;">DAGMaxRankIncrease=3D<wbr>MinHopRankIncrea=
se</span>?<u></u><u></u></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)">[Pascal] Agreed. I=E2=80=99m st=
ill looking for the piece that you dod not understand. I do not see any=E2=
=80=A6</span></i></b><span style=3D"font-size:11pt;font-family:Calibri,sans=
-serif;color:rgb(31,73,125)"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Looking for inspiring ins=
ights.<u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">[Pascal]
<a href=3D"http://www.inspiringinsights.nl/" target=3D"_blank">http://www.i=
nspiringinsights.<wbr>nl/</a> (but I do not understand a word myself ; )</s=
pan></i></b></p></div></div></div></div></blockquote><div><br></div><div>:-=
)</div><div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0=
px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><=
div lang=3D"EN-US"><div class=3D"gmail-m_57213528153279530WordSection1"><di=
v><div><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif;color:rgb(31,73,125)"><u></u><u></u></span></i></b></=
p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></i></b></p=
>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">Take care,<span class=3D"gmail-HOEnZb"=
><font color=3D"#888888"><u></u><u></u></font></span></span></i></b></p><sp=
an class=3D"gmail-HOEnZb"><font color=3D"#888888">
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></i></b></p=
>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">Pascal<u></u><u></u></span></i></b></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
</font></span></div><div><div class=3D"gmail-h5">
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Thomas<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">=3D=3D=3D=3D<u></u><u></u=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Section 6.7.6:<u></u><u><=
/u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">MaxRankIncrease: 16-bit u=
nsigned integer used to configure<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"background=
:yellow">DAGMaxRankIncrease</span>, the allowable increase in Rank in suppo=
rt<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">of local repair. If <span=
 style=3D"background:yellow">
DAGMaxRankIncrease </span>is 0, then this<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">mechanism is disabled.<u>=
</u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Section 8.2.24:<u></u><u>=
</u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Let L be the lowest Rank within a DODAG Version =
that a given node</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">has advertised. Within the same DODAG Version, t=
hat node MUST</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">NOT advertise an effective Rank higher than L +<=
/span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:yellow">DAGMaxRankIncrease</span><span=
 style=3D"font-family:&quot;Courier New&quot;">. INFINITE_RANK is an except=
ion to this rule:</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">a node MAY advertise an INFINITE_RANK within a D=
ODAG Version</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">without restriction. If a node=E2=80=99s Rank we=
re to be higher than</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">allowed by L +
<span style=3D"background:yellow">DAGMaxRankIncrease</span>, when it advert=
ises Rank, it</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">MUST advertise its Rank as INFINITE_RANK.</span>=
<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">Section <a href=3D"http:/=
/8.2.2.4" target=3D"_blank">
8.2.2.4</a>:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">A node is allowed to join any DODAG Version that=
 it has never been a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">prior member of without any restrictions, but if=
 the node has been a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">prior member of the DODAG Version, then it must =
continue to observe</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">the rule that it may not advertise a Rank higher=
 than</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">L+<span style=3D"background:yellow">DAGMaxRankIn=
crease</span> at any point in the life of the DODAG Version.</span><u></u><=
u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:aqua">This rule must be observed so as=
 not to create a loophole that would</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:aqua">allow the node to effectively in=
crement its Rank all the way to</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:aqua">INFINITE_RANK, which may have im=
pact on other nodes and create a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;;background:aqua">resource-wasting count-to-infini=
ty scenario.</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">-- <u></u><u></u></p>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">______________________________<wbr>_________</sp=
an><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Thomas Watteyne, PhD</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Research Scientist &amp; Innovator, Inria</span>=
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Sr Networking Design Eng, Linear Tech</span><u><=
/u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Founder &amp; co-lead, UC Berkeley OpenWSN</span=
><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">Co-chair, IETF 6TiSCH</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;"><a href=3D"http://www.thomaswatteyne.com" target=
=3D"_blank">www.thomaswatteyne.com</a></span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-famil=
y:&quot;Courier New&quot;">______________________________<wbr>_________</sp=
an><u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div></div></div>
</div>
</div>

</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><div style=3D"f=
ont-size:small"><font face=3D"monospace, monospace">_______________________=
________________</font></div><div style=3D"font-size:small"><font face=3D"m=
onospace, monospace"><br></font></div><div style=3D"font-size:small"><font =
face=3D"monospace, monospace">Thomas Watteyne, PhD</font></div><div style=
=3D"font-size:small"><font face=3D"monospace, monospace">Research Scientist=
 &amp; Innovator, Inria</font></div><div style=3D"font-size:small"><font fa=
ce=3D"monospace, monospace">Sr Networking Design Eng, Linear Tech</font></d=
iv><div style=3D"font-size:small"><font face=3D"monospace, monospace">Found=
er &amp; co-lead, UC Berkeley OpenWSN</font></div><div style=3D"font-size:s=
mall"><font face=3D"monospace, monospace">Co-chair, IETF 6TiSCH</font></div=
><div style=3D"font-size:small"><font face=3D"monospace, monospace"><br></f=
ont></div><div style=3D"font-size:small"><font face=3D"monospace, monospace=
"><a href=3D"http://www.thomaswatteyne.com" target=3D"_blank">www.thomaswat=
teyne.com</a></font></div><div style=3D"font-size:small"><font face=3D"mono=
space, monospace">_______________________________________</font></div></div=
></div></div></div>
</div></div>

--f403043790402fa7870558856fcd--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Thomas Watteyne <thomas.watteyne@inria.fr>
CC: IETF ROLL <roll@ietf.org>, "6tisch@ietf.org" <6tisch@ietf.org>
Thread-Topic: [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Xavi Vilajosana Guillen <xvilajosana@uoc.edu>
CC: Thomas Watteyne <thomas.watteyne@inria.fr>, IETF ROLL <roll@ietf.org>, "6tisch@ietf.org" <6tisch@ietf.org>
Thread-Topic: [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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Subject: Re: [Roll] [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Thomas Watteyne <thomas.watteyne@inria.fr>
CC: IETF ROLL <roll@ietf.org>, "6tisch@ietf.org" <6tisch@ietf.org>
Thread-Topic: [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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Subject: Re: [Roll] [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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From: Thomas Watteyne <thomas.watteyne@inria.fr>
Date: Wed, 6 Sep 2017 17:38:06 +0200
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
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Subject: Re: [Roll] [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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OK, so your recommendation is to
use DAGMaxRankIncrease=3DMinHopRankIncrease-1, and have a node that violate=
s
DAGMaxRankIncrease detach, create a floating DAG, and reattach?

On Wed, Sep 6, 2017 at 5:30 PM, Pascal Thubert (pthubert) <
pthubert@cisco.com> wrote:

> Hello Thomas :
>
>
>
> The mechanism to disable is the ability to increase the Rank above L
> without poisoning, which effectively means moving down the DODAG and thus
> risking a loop.
>
> To there can be no count to infinity. The node has to detach, poison (e.g=
.
> by rooting a floating DAG, or by exposing an infinite Rank), observe for =
a
> while till its descendants have acted on it (we cannot afford the diffusi=
on
> algorithm so that=E2=80=99s an approximation) and then the node can move =
back,
> deeper than it originally was since L is now reset.
>
>
>
> The way to signal that it risking CTI is acceptable is signaled by a
> non-zero value of the MaxRankIncrease in the DODAG Configuration option. =
I
> agree with you that a value below MinHopRankIncrease is in fact harmless
> and c/should be used.
>
>
>
> Is that your question?
>
>
>
> Pascal
>
>
>
>
>
>
>
> *From:* Thomas Watteyne [mailto:thomas.watteyne@inria.fr]
> *Sent:* mercredi 6 septembre 2017 15:36
> *To:* Pascal Thubert (pthubert) <pthubert@cisco.com>
> *Cc:* IETF ROLL <roll@ietf.org>; 6tisch@ietf.org
> *Subject:* Re: [6tisch] clarifying question about RPL: DAGMaxRankIncrease
>
>
>
> inline
>
>
>
> On Wed, Sep 6, 2017 at 2:02 PM, Pascal Thubert (pthubert) <
> pthubert@cisco.com> wrote:
>
>
>
>
>
> *From:* 6tisch [mailto:6tisch-bounces@ietf.org] *On Behalf Of *Thomas
> Watteyne
> *Sent:* mercredi 6 septembre 2017 08:20
> *To:* IETF ROLL <roll@ietf.org>; 6tisch@ietf.org
> *Subject:* [6tisch] clarifying question about RPL: DAGMaxRankIncrease
>
>
>
> All,
>
>
>
> While re-reading RFC6550 for the 10^6's time, and realize I have some
> fundamental questions about DAGMaxRankIncrease...
>
>
>
> In RFC6550, DAGMaxRankIncrease appears a grand total of 5 times (listed
> at the bottom of this e-mail for pedantic completeness).
>
>
>
> *Question 1: rationale*
>
>
>
> The rationale of having DAGMaxRankIncrease is explained in the last
> sentence below. But the sentence is not 100% clear, at least to me.
>
>
>
> Do you agree with the statement that "DAGMaxRankIncrease is there to
> limit the count-to-infinity"?
>
> *[Pascal] YES*
>
> That is, if parent and child and swapping roles, rather than counting to
> infinity, they count to DAGMaxRankIncrease. To put in another way, when a
> node's rank increases to L+DAGMaxRankIncrease, the node has serious
> reasons to believe it is in a count-to-infinity spiral.
>
> *[Pascal] YES*
>
>
>
> Please do comment if my comment is false!
>
> *[Pascal] No comment : )*
>
>
>
> *Question 2: recommended value*
>
>
>
> Neither RFC6550, RFC8180 nor RFC6552 give any indication as to what value
> to pick for DAGMaxRankIncrease.
>
> *[Pascal] I=E2=80=99d suggest 0; this relates to the chances of picking a=
 child of
> yours in a down spiral. If you=E2=80=99re lucky, you pick a parent below =
you that
> is not your descendant and the method succeeds. If you are unlucky, you a=
re
> one of his ancestors and a loop is created. If he has multiple parents,
> only some of the packets may be affected. IOW: You are lucky and local
> repair is really quick. You are unlucky and it is really long. You have a=
n
> external hint, good for you. You don=E2=80=99t and you expect a determini=
stic
> behavior, do not use that scheme. Note: these comments come from someone
> who opposed that mechanism in the RPL design.*
>
>
>
> I have a hard time following. Setting DAGMaxRankIncrease to 0 means you
> disable the bounding on the count-to-infinity, and you run the risk of
> having an actual count to infinity. Is that what you suggest?
>
>
>
>
>
> I understand that, the larger the value of DAGMaxRankIncrease, the longer
> the count-to-infinity spiral goes on. This means having packets reach the=
ir
> hop limit, and get dropped. Bad.
>
>
>
> *[Pascal] True*
>
>
>
> The other extreme is to set DAGMaxRankIncrease=3DMinHopRankIncrease. This
> results in a local repair as soon as the mote increases it rank to that o=
f
> its children.
>
> *[Pascal] True, one may attach to an ex-sibling. That should be mostly
> harmless since it does not break the feasibility condition, which is, do
> not attach to someone that advertises a Rank worse than you ever advertis=
ed
> (since you last poisoned), expressed in units of MinHopRankIncrease.*
>
>
>
>
>
> It follows that the value of DAGMaxRankIncrease should be larger than
> MinHopRankIncrease, but not too large so count-to-infinity aborts
> quickly. OK.
>
> *[Pascal] No. You do not have to use the mechanism at all (or use it as
> above)*
>
>
>
> But why should I have DAGMaxRankIncrease>MinHopRankIncrease at all? This
> would allow count-to-infinity to start, and packets to get dropped, which
> is a big no-no in serious networks. What is the danger of having
> DAGMaxRankIncrease=3DMinHopRankIncrease?
>
> *[Pascal] Agreed. I=E2=80=99m still looking for the piece that you dod no=
t
> understand. I do not see any=E2=80=A6*
>
>
>
> Looking for inspiring insights.
>
> *[Pascal] http://www.inspiringinsights.nl/
> <http://www.inspiringinsights.nl/> (but I do not understand a word myself=
 ;
> )*
>
>
>
> :-)
>
>
>
>
>
> *Take care,*
>
>
>
> *Pascal*
>
>
>
>
>
> Thomas
>
>
>
> =3D=3D=3D=3D
>
>
>
> Section 6.7.6:
>
>
>
> MaxRankIncrease: 16-bit unsigned integer used to configure
>
> DAGMaxRankIncrease, the allowable increase in Rank in support
>
> of local repair. If DAGMaxRankIncrease is 0, then this
>
> mechanism is disabled.
>
>
>
> Section 8.2.24:
>
>
>
> Let L be the lowest Rank within a DODAG Version that a given node
>
> has advertised. Within the same DODAG Version, that node MUST
>
> NOT advertise an effective Rank higher than L +
>
> DAGMaxRankIncrease. INFINITE_RANK is an exception to this rule:
>
> a node MAY advertise an INFINITE_RANK within a DODAG Version
>
> without restriction. If a node=E2=80=99s Rank were to be higher than
>
> allowed by L + DAGMaxRankIncrease, when it advertises Rank, it
>
> MUST advertise its Rank as INFINITE_RANK.
>
>
>
> Section 8.2.2.4:
>
>
>
> A node is allowed to join any DODAG Version that it has never been a
>
> prior member of without any restrictions, but if the node has been a
>
> prior member of the DODAG Version, then it must continue to observe
>
> the rule that it may not advertise a Rank higher than
>
> L+DAGMaxRankIncrease at any point in the life of the DODAG Version.
>
> This rule must be observed so as not to create a loophole that would
>
> allow the node to effectively increment its Rank all the way to
>
> INFINITE_RANK, which may have impact on other nodes and create a
>
> resource-wasting count-to-infinity scenario.
>
>
>
> --
>
> _______________________________________
>
>
>
> Thomas Watteyne, PhD
>
> Research Scientist & Innovator, Inria
>
> Sr Networking Design Eng, Linear Tech
>
> Founder & co-lead, UC Berkeley OpenWSN
>
> Co-chair, IETF 6TiSCH
>
>
>
> www.thomaswatteyne.com
>
> _______________________________________
>
>
>
>
>
> --
>
> _______________________________________
>
>
>
> Thomas Watteyne, PhD
>
> Research Scientist & Innovator, Inria
>
> Sr Networking Design Eng, Linear Tech
>
> Founder & co-lead, UC Berkeley OpenWSN
>
> Co-chair, IETF 6TiSCH
>
>
>
> www.thomaswatteyne.com
>
> _______________________________________
>



--=20
_______________________________________

Thomas Watteyne, PhD
Research Scientist & Innovator, Inria
Sr Networking Design Eng, Linear Tech
Founder & co-lead, UC Berkeley OpenWSN
Co-chair, IETF 6TiSCH

www.thomaswatteyne.com
_______________________________________

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<div dir=3D"ltr">OK, so your recommendation is to use=C2=A0DAGMaxRankIncrea=
se=3DMinHopRankIncrease-1, and have a node that violates DAGMaxRankIncrease=
 detach, create a floating DAG, and reattach?</div><div class=3D"gmail_extr=
a"><br><div class=3D"gmail_quote">On Wed, Sep 6, 2017 at 5:30 PM, Pascal Th=
ubert (pthubert) <span dir=3D"ltr">&lt;<a href=3D"mailto:pthubert@cisco.com=
" target=3D"_blank">pthubert@cisco.com</a>&gt;</span> wrote:<br><blockquote=
 class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc soli=
d;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-893828213668891359WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Hello Thomas=C2=A0:<u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">The mechanism to disable is the abili=
ty to increase the Rank above L without poisoning, which effectively means =
moving down the DODAG and thus risking a loop.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">To there can be no count to infinity.=
 The node has to detach, poison (e.g. by rooting a floating DAG, or by expo=
sing an infinite Rank), observe for a while till
 its descendants have acted on it (we cannot afford the diffusion algorithm=
 so that=E2=80=99s an approximation) and then the node can move back, deepe=
r than it originally was since L is now reset.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">The way to signal that it risking CTI=
 is acceptable is signaled by a non-zero value of the MaxRankIncrease in th=
e DODAG Configuration option. I agree with you
 that a value below MinHopRankIncrease is in fact harmless and c/should be =
used.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Is that your question?<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Pascal<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">From:</span></b><sp=
an style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> T=
homas Watteyne [mailto:<a href=3D"mailto:thomas.watteyne@inria.fr" target=
=3D"_blank">thomas.watteyne@inria.<wbr>fr</a>]
<br>
<b>Sent:</b> mercredi 6 septembre 2017 15:36<br>
<b>To:</b> Pascal Thubert (pthubert) &lt;<a href=3D"mailto:pthubert@cisco.c=
om" target=3D"_blank">pthubert@cisco.com</a>&gt;<br>
<b>Cc:</b> IETF ROLL &lt;<a href=3D"mailto:roll@ietf.org" target=3D"_blank"=
>roll@ietf.org</a>&gt;; <a href=3D"mailto:6tisch@ietf.org" target=3D"_blank=
">6tisch@ietf.org</a><br>
<b>Subject:</b> Re: [6tisch] clarifying question about RPL: DAGMaxRankIncre=
ase<u></u><u></u></span></p><div><div class=3D"h5">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">inline<u></u><u></u></p=
>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">On Wed, Sep 6, 2017 at =
2:02 PM, Pascal Thubert (pthubert) &lt;<a href=3D"mailto:pthubert@cisco.com=
" target=3D"_blank">pthubert@cisco.com</a>&gt; wrote:<u></u><u></u></p>
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m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
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<span lang=3D"FR" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;=
,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
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<span lang=3D"FR" style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;=
,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
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<b><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-ser=
if">From:</span></b><span style=3D"font-size:11.0pt;font-family:&quot;Calib=
ri&quot;,sans-serif"> 6tisch [mailto:<a href=3D"mailto:6tisch-bounces@ietf.=
org" target=3D"_blank">6tisch-bounces@ietf.<wbr>org</a>]
<b>On Behalf Of </b>Thomas Watteyne<br>
<b>Sent:</b> mercredi 6 septembre 2017 08:20<br>
<b>To:</b> IETF ROLL &lt;<a href=3D"mailto:roll@ietf.org" target=3D"_blank"=
>roll@ietf.org</a>&gt;;
<a href=3D"mailto:6tisch@ietf.org" target=3D"_blank">6tisch@ietf.org</a><br=
>
<b>Subject:</b> [6tisch] clarifying question about RPL: DAGMaxRankIncrease<=
/span><u></u><u></u></p>
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=C2=A0<u></u><u></u></p>
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All,<u></u><u></u></p>
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=C2=A0<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
While re-reading RFC6550 for the 10^6&#39;s time, and realize I have some f=
undamental questions about=C2=A0<span style=3D"font-family:&quot;Courier Ne=
w&quot;">DAGMaxRankIncrease</span>...<u></u><u></u></p>
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=C2=A0<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
In RFC6550,=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMax=
RankIncrease</span>=C2=A0<wbr>appears a grand total of 5 times (listed at t=
he bottom of this e-mail for pedantic completeness).<u></u><u></u></p>
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=C2=A0<u></u><u></u></p>
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<u>Question 1: rationale</u><u></u><u></u></p>
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=C2=A0<u></u><u></u></p>
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The rationale of having=C2=A0<span style=3D"font-family:&quot;Courier New&q=
uot;">DAGMaxRankIncrease</span>=C2=A0is explained in the
<span style=3D"background:aqua">last sentence below</span>. But the sentenc=
e is not 100% clear, at least to me.<u></u><u></u></p>
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=C2=A0<u></u><u></u></p>
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Do you agree with the statement that &quot;<span style=3D"font-family:&quot=
;Courier New&quot;">DAGMaxRankIncrease</span>=C2=A0is there to limit the co=
unt-to-infinity&quot;?
<u></u><u></u></p>
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<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">[Pascal] YES</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
That is, if parent and child and swapping roles, rather than counting to in=
finity, they count to=C2=A0<span style=3D"font-family:&quot;Courier New&quo=
t;">DAGMaxRankIncrease</span>. To put in another way, when a node&#39;s ran=
k increases to
<span style=3D"font-family:&quot;Courier New&quot;">L+DAGMaxRankIncrease</s=
pan>, the node has serious reasons to believe it is in a count-to-infinity =
spiral.<u></u><u></u></p>
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<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">[Pascal] YES</span></i></b><u></u><u></u></p>
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=C2=A0<u></u><u></u></p>
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Please do comment if my comment is false!<u></u><u></u></p>
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<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">[Pascal] No comment : )</span></i></b><u></u><u></u></=
p>
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=C2=A0<u></u><u></u></p>
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<u>Question 2: recommended value</u><u></u><u></u></p>
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=C2=A0<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
Neither RFC6550, RFC8180 nor RFC6552 give any indication as to what value t=
o pick for=C2=A0<span style=3D"font-family:&quot;Courier New&quot;">DAGMaxR=
ankIncrease</span>.<u></u><u></u></p>
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<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">[Pascal] I=E2=80=99d suggest 0; this relates to the ch=
ances of picking a child of yours in a down spiral. If you=E2=80=99re lucky=
, you pick a parent below you that is not your descendant and
 the method succeeds. If you are unlucky, you are one of his ancestors and =
a loop is created. If he has multiple parents, only some of the packets may=
 be affected. IOW: You are lucky and local repair is really quick. You are =
unlucky and it is really long. You
 have an external hint, good for you. You don=E2=80=99t and you expect a de=
terministic behavior, do not use that scheme. Note: these comments come fro=
m someone who opposed that mechanism in the RPL design.</span></i></b><u></=
u><u></u></p>
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</blockquote>
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<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
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<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">I have a hard time foll=
owing. Setting=C2=A0DAGMaxRankIncrease to 0 means you disable the bounding =
on the count-to-infinity, and you run the risk of having an actual count to=
 infinity. Is that what you suggest?<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">=C2=A0<u></u><u></u></p=
>
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m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
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=C2=A0<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
I understand that, the larger the value of=C2=A0<span style=3D"font-family:=
&quot;Courier New&quot;">DAGMaxRankIncrease</span>, the longer the count-to=
-infinity spiral goes on. This means having packets reach their hop limit, =
and get dropped. Bad.<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">[Pascal] True</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;=
color:#1f497d">=C2=A0</span><u></u><u></u></p>
</div>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
The other extreme is to set=C2=A0<span style=3D"font-family:&quot;Courier N=
ew&quot;">DAGMaxRankIncrease=3D<wbr>MinHopRankIncrease</span>. This results=
 in a local repair as soon as the mote increases it rank to that of its chi=
ldren.<u></u><u></u></p>
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<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">[Pascal] True, one may attach to an ex-sibling. That s=
hould be mostly harmless since it does not break the feasibility condition,=
 which is, do not attach to someone that advertises
 a Rank worse than you ever advertised (since you last poisoned), expressed=
 in units of MinHopRankIncrease.</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;=
color:#1f497d">=C2=A0</span><u></u><u></u></p>
</div>
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=C2=A0<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
It follows that the value of=C2=A0<span style=3D"font-family:&quot;Courier =
New&quot;">DAGMaxRankIncrease</span>=C2=A0should be larger than
<span style=3D"font-family:&quot;Courier New&quot;">MinHopRankIncrease</spa=
n>, but not too large so count-to-infinity aborts quickly. OK.<u></u><u></u=
></p>
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<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">[Pascal] No. You do not have to use the mechanism at a=
ll (or use it as above)</span></i></b><u></u><u></u></p>
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=C2=A0<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
But why should I have=C2=A0<span style=3D"font-family:&quot;Courier New&quo=
t;">DAGMaxRankIncrease&gt;<wbr>MinHopRankIncrease</span> at all? This would=
 allow count-to-infinity to start, and packets to get dropped, which is a b=
ig no-no in serious networks. What is the danger of having=C2=A0<span style=
=3D"font-family:&quot;Courier New&quot;">DAGMaxRankIncrease=3D<wbr>MinHopRa=
nkIncrease</span>?<u></u><u></u></p>
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<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">[Pascal] Agreed. I=E2=80=99m still looking for the pie=
ce that you dod not understand. I do not see any=E2=80=A6</span></i></b><u>=
</u><u></u></p>
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=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
Looking for inspiring insights.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">[Pascal]
<a href=3D"http://www.inspiringinsights.nl/" target=3D"_blank">http://www.i=
nspiringinsights.<wbr>nl/</a> (but I do not understand a word myself ; )</s=
pan></i></b><u></u><u></u></p>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">:-)<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">=C2=A0<u></u><u></u></p=
>
</div>
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m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
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<div>
<div>
<div>
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<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">=C2=A0</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">Take care,</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">=C2=A0</span></i></b><span style=3D"color:#888888"><u>=
</u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">Pascal</span></i></b><span style=3D"color:#888888"><u>=
</u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;=
color:#1f497d">=C2=A0</span><span style=3D"color:#888888"><u></u><u></u></s=
pan></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
Thomas<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=3D=3D=3D=3D<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
Section 6.7.6:<u></u><u></u></p>
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<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
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<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
MaxRankIncrease: 16-bit unsigned integer used to configure<u></u><u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"background:yellow">DAGMaxRankIncrease</span>, the allowable =
increase in Rank in support<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
of local repair. If <span style=3D"background:yellow">DAGMaxRankIncrease </=
span>is 0, then this<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
mechanism is disabled.<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
Section 8.2.24:<u></u><u></u></p>
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<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">Let L be the lowest Ran=
k within a DODAG Version that a given node</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">has advertised. Within =
the same DODAG Version, that node MUST</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">NOT advertise an effect=
ive Rank higher than L +</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;;background:yellow">DAGMa=
xRankIncrease</span><span style=3D"font-family:&quot;Courier New&quot;">. I=
NFINITE_RANK is an exception to this rule:</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">a node MAY advertise an=
 INFINITE_RANK within a DODAG Version</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">without restriction. If=
 a node=E2=80=99s Rank were to be higher than</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">allowed by L + <span st=
yle=3D"background:yellow">
DAGMaxRankIncrease</span>, when it advertises Rank, it</span><u></u><u></u>=
</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">MUST advertise its Rank=
 as INFINITE_RANK.</span><u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
Section <a href=3D"http://8.2.2.4" target=3D"_blank">8.2.2.4</a>:<u></u><u>=
</u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">A node is allowed to jo=
in any DODAG Version that it has never been a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">prior member of without=
 any restrictions, but if the node has been a</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">prior member of the DOD=
AG Version, then it must continue to observe</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">the rule that it may no=
t advertise a Rank higher than</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">L+<span style=3D"backgr=
ound:yellow">DAGMaxRankIncrease</span> at any point in the life of the DODA=
G Version.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;;background:aqua">This ru=
le must be observed so as not to create a loophole that would</span><u></u>=
<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;;background:aqua">allow t=
he node to effectively increment its Rank all the way to</span><u></u><u></=
u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;;background:aqua">INFINIT=
E_RANK, which may have impact on other nodes and create a</span><u></u><u><=
/u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;;background:aqua">resourc=
e-wasting count-to-infinity scenario.</span><u></u><u></u></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
-- <u></u><u></u></p>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">_______________________=
_______<wbr>_________</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">Thomas Watteyne, PhD</s=
pan><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">Research Scientist &amp=
; Innovator, Inria</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">Sr Networking Design En=
g, Linear Tech</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">Founder &amp; co-lead, =
UC Berkeley OpenWSN</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">Co-chair, IETF 6TiSCH</=
span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;"><a href=3D"http://www.t=
homaswatteyne.com" target=3D"_blank">www.thomaswatteyne.com</a></span><u></=
u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">_______________________=
_______<wbr>_________</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><br>
<br clear=3D"all">
<u></u><u></u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">-- <u></u><u></u></p>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">______________________________<wbr>_________</=
span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">Thomas Watteyne, PhD</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">Research Scientist &amp; Innovator, Inria</spa=
n><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">Sr Networking Design Eng, Linear Tech</span><u=
></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">Founder &amp; co-lead, UC Berkeley OpenWSN</sp=
an><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">Co-chair, IETF 6TiSCH</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;"><a href=3D"http://www.thomaswatteyne.com" targ=
et=3D"_blank">www.thomaswatteyne.com</a></span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">______________________________<wbr>_________</=
span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div></div></div>
</div>

</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br><div class=
=3D"gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><d=
iv><div dir=3D"ltr"><div style=3D"font-size:small"><font face=3D"monospace,=
 monospace">_______________________________________</font></div><div style=
=3D"font-size:small"><font face=3D"monospace, monospace"><br></font></div><=
div style=3D"font-size:small"><font face=3D"monospace, monospace">Thomas Wa=
tteyne, PhD</font></div><div style=3D"font-size:small"><font face=3D"monosp=
ace, monospace">Research Scientist &amp; Innovator, Inria</font></div><div =
style=3D"font-size:small"><font face=3D"monospace, monospace">Sr Networking=
 Design Eng, Linear Tech</font></div><div style=3D"font-size:small"><font f=
ace=3D"monospace, monospace">Founder &amp; co-lead, UC Berkeley OpenWSN</fo=
nt></div><div style=3D"font-size:small"><font face=3D"monospace, monospace"=
>Co-chair, IETF 6TiSCH</font></div><div style=3D"font-size:small"><font fac=
e=3D"monospace, monospace"><br></font></div><div style=3D"font-size:small">=
<font face=3D"monospace, monospace"><a href=3D"http://www.thomaswatteyne.co=
m" target=3D"_blank">www.thomaswatteyne.com</a></font></div><div style=3D"f=
ont-size:small"><font face=3D"monospace, monospace">_______________________=
________________</font></div></div></div></div></div>
</div>

--f403043790408b22bc05588722a9--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Thomas Watteyne <thomas.watteyne@inria.fr>
CC: IETF ROLL <roll@ietf.org>, "6tisch@ietf.org" <6tisch@ietf.org>
Thread-Topic: [6tisch] clarifying question about RPL: DAGMaxRankIncrease
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--_000_234d71522b564e7a8a9e566d724fa5a6XCHRCD001ciscocom_--


From nobody Wed Sep  6 10:17:52 2017
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Subject: [Roll] IPR Disclosure Cisco's Statement about IPR related to draft-ietf-roll-efficient-npdao
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Dear RAHUL ARVIND JADHAV, Rabi Narayan Sahoo, Zhen Cao:


An IPR disclosure that pertains to your Internet-Draft entitled "No-Path
DAO modifications" (draft-ietf-roll-efficient-npdao) was submitted to
the IETF Secretariat on  and has been posted on the "IETF Page of
Intellectual Property Rights Disclosures"
(https://datatracker.ietf.org/ipr/3063/). The title of the IPR disclosure is
"Cisco's Statement about IPR related to draft-ietf-roll-efficient-npdao"


Thank you

IETF Secretariat


From nobody Sat Sep  9 04:45:13 2017
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Subject: [Roll] I-D Action: draft-ietf-roll-aodv-rpl-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           : Asymmetric AODV-P2P-RPL in Low-Power and Lossy Networks (LLNs)
        Authors         : Satish Anamalamudi
                          Mingui Zhang
                          Abdur Rashid Sangi
                          Charles E. Perkins
                          S.V.R Anand
	Filename        : draft-ietf-roll-aodv-rpl-02.txt
	Pages           : 17
	Date            : 2017-09-09

Abstract:
   Route discovery for symmetric and asymmetric Point-to-Point (P2P)
   traffic flows is a desirable feature in Low power and Lossy Networks
   (LLNs).  For that purpose, this document specifies a reactive P2P
   route discovery mechanism for hop-by-hop routing (storing mode) based
   on Ad Hoc On-demand Distance Vector Routing (AODV) based RPL
   protocol.  Two separate Instances are used to construct directional
   paths in case some of the links between source and target node are
   asymmetric.


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

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

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


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

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


From nobody Tue Sep 19 04:04:48 2017
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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           : Root initiated routing state in RPL
        Authors         : Pascal Thubert
                          James Pylakutty
	Filename        : draft-ietf-roll-dao-projection-02.txt
	Pages           : 20
	Date            : 2017-09-19

Abstract:
   This document proposes a protocol extension to RPL that enables to
   install a limited amount of centrally-computed routes in a RPL graph,
   enabling loose source routing down a non-storing mode DODAG, or
   transversal routes inside the DODAG.  As opposed to the classical
   route injection in RPL that are injected by the end devices, this
   draft enables the root of the DODAG to projects the routes that are
   needed on the nodes where they should be installed.


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

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

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


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

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

