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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: Published draft-ietf-roll-unaware-leaves-03
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Subject: [Roll] Published draft-ietf-roll-unaware-leaves-03
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Dear all :

We just published 03 of the RUL draft. This version incorporates a number o=
f major changes that we discussed at the meeting and on this ML since:

  *   Modified DAO to add the ROVR. After discussion with Rahul, we clarifi=
ed that this could only be optional, because of 1) backward compatibility a=
nd 2) amount of state in the intermediate nodes in storing mode.
  *   Use the DCO to clear a rejected registration/refresh. If the 6LBR det=
ects a duplication or a movement and returns a negative starus to the Root,=
  The Root can use an asynchronous DCO to the 6LR, which turns it in a NA(E=
ARO, Status). The draft now adds the IANA registry of Status values that wa=
s missing in RFC 6550, and maps the 6LoWPAN Status Values in RPL.
  *   Modified RPL to indicate that Non-Storing signaling MUST be used for =
External routes signaled by the 'E' flag in the transit option. This will h=
appen even in storing Mode. The reason is to be able to tunnel to the 6LR (=
that appears as in the Transit option) in order to get rid of RPL artifacts=
 and RFC 8138 compression before the packet is forwarded externally.
  *   We did a number of smaller corrections, like clarified the language o=
n what is a leaf, RUL, RAL (aligned with useofrplinfo) and introduced RAN (=
as either a RAL or a RPL router).
  *   Michael is now a co-author

Please consider this and let us know your thoughts.

What's left to be done:

  *   Signal whether the ROVR in DAO should be used in capability/config op=
tions (dependency on the discussion between Michael and Rahul on the MOP dr=
aft)
  *   Signal the capability by the root to proxy the EDAR in behalf of the =
6LR. Should we use the MOP draft or make it protocol independent with 6CIO =
so any routing protocol could be used to proxy?
  *   Interaction with the 6BBR. Based on the discussion with Michael, I se=
parated that flow, so in 03 it disappeared. The goal is to have another sec=
tion on that.
  *   ?

Other discussion: the new RUL also updates

  *   Impact on useofrplinfo: the change that the (E flag) =3D> (non-storin=
g signaling + tunnel to the 6LR)
  *   Impact on DCO draft: change reserved into Status field

Since those specs are not published yet, we could piggy-back the changes th=
ere but that means taking the drafts off the RFC editor's hands.

All the best;

Pascal

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<p class=3D"MsoNormal"><span lang=3D"FR">Dear all&nbsp;:<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">We just published 03 of the RUL draft. This version =
incorporates a number of major changes that we discussed at the meeting and=
 on this ML since:<o:p></o:p></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo1"><u>Modified DAO to add the ROVR</u>. After discussion with Rahul, we =
clarified that this could only be optional, because of 1) backward compatib=
ility and 2) amount of state in the
 intermediate nodes in storing mode.<o:p></o:p></li><li class=3D"MsoListPar=
agraph" style=3D"margin-left:0cm;mso-list:l0 level1 lfo1"><u>Use the DCO to=
 clear a rejected registration/refresh</u>. If the 6LBR detects a duplicati=
on or a movement and returns a negative starus to the Root,&nbsp; The Root =
can use an asynchronous
 DCO to the 6LR, which turns it in a NA(EARO, Status). The draft now adds t=
he IANA registry of Status values that was missing in RFC 6550, and maps th=
e 6LoWPAN Status Values in RPL.<o:p></o:p></li><li class=3D"MsoListParagrap=
h" style=3D"margin-left:0cm;mso-list:l0 level1 lfo1">Modified RPL to indica=
te that
<u>Non-Storing signaling MUST be used for External rout</u>es signaled by t=
he &#8216;E&#8217; flag in the transit option. This will happen even in sto=
ring Mode. The reason is to be able to tunnel to the 6LR (that appears as i=
n the Transit option) in order to get rid of
 RPL artifacts and RFC 8138 compression before the packet is forwarded exte=
rnally.<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:=
0cm;mso-list:l0 level1 lfo1">We did a number of smaller corrections, like c=
larified the language on what is a leaf, RUL, RAL (aligned with useofrplinf=
o) and introduced RAN (as either a RAL or a RPL router).<o:p></o:p></li><li=
 class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 lfo=
1">Michael is now a co-author<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please consider this and let us know your thoughts.<=
o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">What&#8217;s left to be done:<o:p></o:p></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo1">Signal whether the ROVR in DAO should be used in capability/config op=
tions (dependency on the discussion between Michael and Rahul on the MOP dr=
aft)<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0cm=
;mso-list:l0 level1 lfo1">Signal the capability by the root to proxy the ED=
AR in behalf of the 6LR. Should we use the MOP draft or make it protocol in=
dependent with 6CIO so any routing protocol could be used
 to proxy?<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-le=
ft:0cm;mso-list:l0 level1 lfo1">Interaction with the 6BBR. Based on the dis=
cussion with Michael, I separated that flow, so in 03 it disappeared. The g=
oal is to have another section on that.<o:p></o:p></li><li class=3D"MsoList=
Paragraph" style=3D"margin-left:0cm;mso-list:l0 level1 lfo1">?<o:p></o:p></=
li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Other discussion: the new RUL also updates<o:p></o:p=
></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo1">Impact on useofrplinfo: the change that the (E flag) =3D&gt; (non-sto=
ring signaling &#43; tunnel to the 6LR)<o:p></o:p></li><li class=3D"MsoList=
Paragraph" style=3D"margin-left:0cm;mso-list:l0 level1 lfo1">Impact on DCO =
draft: change reserved into Status field<o:p></o:p></li></ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Since those specs are not published yet, we could pi=
ggy-back the changes there but that means taking the drafts off the RFC edi=
tor&#8217;s hands.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All the best;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
</body>
</html>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] do capabilities need to understood, can they be added?
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Subject: Re: [Roll] do capabilities need to understood, can they be added?
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Dear all:

Seems to me that sometimes the capability of the node is something that onl=
y the root cares about.=20
At least that's true when the root needs to know if all nodes support a cap=
ability. It wants to flood a query and gather the responses from all. Missi=
ng queries would mean a unicast retry I guess.

At other times it might be something that the parent cares about. In that c=
ase it asks one or all of its children.

So we're after a capability exchange flow that is unicast or multicast, wit=
h a unicast response. Either from parent to child or from root to any. The =
flow would be independent of the storing vs. non-storing MOP.
We do not really have a flow like that in RPL. It's akin to a software upda=
te, when the root wishes to now if all nodes have received the full image.

The DIO could be stretched to convey the ask to a group, but it's hard to m=
ake it reliable. The DAO even less OK since it carries destination not node=
 information. As of today the root does not really know if multiple address=
es are on a same node.

All in all it seems that we are after something that is needed by RPL but o=
n the side of the current protocol. I'm not too sure that we should overloa=
d the current messages for this. Rather, we may build new objects for Nodes=
 information and capability. Like a unicast or multicast NIS (Node Info Sol=
icitation) and a NAO (Node Advertisement Object). We'd design operations th=
at are independent of the current MOPs. Note that we could use local broadc=
ast NAO to discover siblings and siblings siblings, something P DAO needs a=
nyway.

Please see below

>     mcr> Are they individualized, or does every node in the LLN have to s=
upport
>     mcr> a capability before it can be used?
>=20
> Rahul Arvind Jadhav <rahul.jadhav@huawei.com> wrote:
>     rj> Nice point. I haven't thought about this in detail. In non-storin=
g
>     rj> MOP, it may not be required that all the nodes support capabiliti=
es
>     rj> but in storing MOP, every 6LR needs to add the cap (if present) o=
f
>     rj> the downstream child, thus requiring every node to support it. Th=
is
>     rj> definitely needs handling in the draft.  [Ref:
>     rj> https://github.com/roll-wg/MOPex-capabilities/issues/1
>=20
> I see:
>=20
> 1) the root announces a capability.  6LRs that understand it may use the
>    new capability unilaterally if they understand it, and see a need for =
it.
>    Nodes that do not understand the new capability are not affected.
>    This could be a control plane thing, or a data plane thing.
>=20
> [RJ] The problem may be in the other direction, .. In storing MOP, how sh=
ould
> a 6LR which does not understand capability treat a DAO containing capabil=
ity?
> Also how should a 6LR treat an unknown option in general?
> 6550 mentions how to treat unknown RPL code but there is no handling for
> unknown option in DIO/DAO. Is there? I searched and could not find.
> Most of the existing implementations just ignore what they don't understa=
nd.
>=20
> 2) the root announces support for capability that it wishes to enable, in
>    order for it be used, every node must support it.  If every DAO from
>    every node supports the capability, then the root announces that it
>    is turned on.
>    This in effect is a two-pass system, requiring either two capability
>    bits.
>    It might be that it is better to encode these two bits are three
>    values (plus 00-not supported).
>=20
> [RJ] Another scenario could be that Root announces support for an optiona=
l
> capability. The 6LN just needs to know whether it could make use of this
> capability of the root to do something. It may not need to reply back to =
the
> root saying I see it and I support it.
> Also should we be using two capability bits or we could use the info on
> whether the bit is set in DIO/DAO to infer the direction.
>=20
> 3) any 6LR may announce a capability to it's children that it received fr=
om
>    it's parent, if it understands that capability.  If it does not, then
>    it MUST clear the capability.
>=20
>    This can be a unilateral capability (like 1), or one that has to be
>    confirmed (like 2).  So this is really 3A and 3B.
> [RJ] I get 3A .. but do we really need 3B. I mean if the node also needs =
to
> indicate that it also supports the same capability to the root then it ca=
n set the
> same bit in the DAO and send it back ... Thus working in both directions.=
 It may
> not be required that capabilities be handshaked in both directions
> mandatorily. For e.g., root may indicate the capability that it has acces=
s to
> 6BBR and that unaware leaves could register through 6LRs. Thus 6LRs could
> proxy the NS (EARO) and other relevant messages. In this case, is it need=
ed
> that 6LR reply back to the root saying it supports unaware leaves?
> There might be another example which requires 6LRs/6LNs to indicate in th=
e
> reply that it supports the feature asked by root using the same cap bit i=
n DAO.
> The DIO/DAO decides the direction but the bit can be the same.
>=20
> 4) any 6LR may announce a capability to it's children, even if it did not
>    receive it from a parent.  The capability is not to be repeated by
>    the children (regardless of whether they understand it), unless they a=
lso
>    wish to enable it.
> [RJ] agree
>=20
> I therefore see several issues to resolve.
> For capabilities that a node understands, it can know which type of capab=
ility
> it is.  For a capability that is unknown, if the behaviour is other than =
"set to
> zero", then we need to tell the node what kind of capability it is, and h=
ow it is
> encoded.
>=20
> Counting above, I see (1)-available, (2)-query, (2)-enable, (3)-available=
, (3)-
> query, (3)-enable, (4)-available.  Conveniently, 7 things, plus all zeros=
.  We
> could encode capabilities in three bits, so the behaviour would be part o=
f the
> encoded.
>=20

Would you encode capabilities in a bit array?
I'm interesting in signaling whether we can live without a capability or if=
 it the node must become leaf if it does not have it.

All the best

Pascal

> --
> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works  -
> =3D IPv6 IoT consulting =3D-
>=20
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll


From nobody Mon Sep  2 08:00:05 2019
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--=-=-=
Content-Type: text/plain


Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    > *   Modified RPL to indicate that Non-Storing signaling MUST be used
    > for External routes signaled by the 'E' flag in the transit
    > option. This will happen even in storing Mode. The reason is to be able
    > to tunnel to the 6LR (that appears as in the Transit option) in order
    > to get rid of RPL artifacts and RFC 8138 compression before the packet
    > is forwarded externally.

This is quite an interesting thing to do, and I think that it brings us
another step step closer to some kind of hybrid storing/non-storing mode.
DAO-projection is obviously the other step.

Many in the WG might not know, but at one point the WG thought that storing and
non-storing operation would be local choices, but it turned out not to work
that way.

    > *   Signal the capability by the root to proxy the EDAR in behalf of
    > the 6LR. Should we use the MOP draft or make it protocol independent
    > with 6CIO so any routing protocol could be used to proxy?

I think we should use the root-announced (non-negotiated) capability.

    > *   Impact on useofrplinfo: the change that the (E flag) =>
    > (non-storing signaling + tunnel to the 6LR)

...

    > Since those specs are not published yet, we could piggy-back the
    > changes there but that means taking the drafts off the RFC editor's
    > hands.

I think that the useofrplinfo change affects only two (maybe) four of the 24
cases, and the case remains where we have an IPv6 Host only.
So I think it is better to Updates: useofrplinfo.

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

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] do capabilities need to understood, can they be added?
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Subject: Re: [Roll] do capabilities need to understood, can they be added?
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In addition to the below I took a refresh look at RFC 6551.=20

https://tools.ietf.org/html/rfc6551#section-3.1 provides a shell for capabi=
lities such as those that we are after.
And
https://tools.ietf.org/html/rfc6551#section-3.2 discusses how to handle a r=
esource that varies over time and is subject to consumption and exhaustion.=
 Storage of routes for P-DAO has similarities with that.

All in all I'm thinking that we could extend Node Metric/Constraint Objects=
 and how they are used for DODAG formation. We could for instance use the m=
etric container as defined for DIO and create at least one new message to r=
eport to the asker for the reasons below.=20

Thoughts?

Pascal

> -----Original Message-----
> From: Pascal Thubert (pthubert)
> Sent: lundi 2 septembre 2019 11:44
> To: Routing Over Low power and Lossy networks <roll@ietf.org>
> Subject: RE: [Roll] do capabilities need to understood, can they be added=
?
>=20
> Dear all:
>=20
> Seems to me that sometimes the capability of the node is something that o=
nly
> the root cares about.
> At least that's true when the root needs to know if all nodes support a
> capability. It wants to flood a query and gather the responses from all. =
Missing
> queries would mean a unicast retry I guess.
>=20
> At other times it might be something that the parent cares about. In that=
 case
> it asks one or all of its children.
>=20
> So we're after a capability exchange flow that is unicast or multicast, w=
ith a
> unicast response. Either from parent to child or from root to any. The fl=
ow
> would be independent of the storing vs. non-storing MOP.
> We do not really have a flow like that in RPL. It's akin to a software up=
date,
> when the root wishes to now if all nodes have received the full image.
>=20
> The DIO could be stretched to convey the ask to a group, but it's hard to=
 make
> it reliable. The DAO even less OK since it carries destination not node
> information. As of today the root does not really know if multiple addres=
ses
> are on a same node.
>=20
> All in all it seems that we are after something that is needed by RPL but=
 on the
> side of the current protocol. I'm not too sure that we should overload th=
e
> current messages for this. Rather, we may build new objects for Nodes
> information and capability. Like a unicast or multicast NIS (Node Info
> Solicitation) and a NAO (Node Advertisement Object). We'd design operatio=
ns
> that are independent of the current MOPs. Note that we could use local
> broadcast NAO to discover siblings and siblings siblings, something P DAO
> needs anyway.
>=20
> Please see below
>=20
> >     mcr> Are they individualized, or does every node in the LLN have to
> support
> >     mcr> a capability before it can be used?
> >
> > Rahul Arvind Jadhav <rahul.jadhav@huawei.com> wrote:
> >     rj> Nice point. I haven't thought about this in detail. In non-stor=
ing
> >     rj> MOP, it may not be required that all the nodes support capabili=
ties
> >     rj> but in storing MOP, every 6LR needs to add the cap (if present)=
 of
> >     rj> the downstream child, thus requiring every node to support it. =
This
> >     rj> definitely needs handling in the draft.  [Ref:
> >     rj> https://github.com/roll-wg/MOPex-capabilities/issues/1
> >
> > I see:
> >
> > 1) the root announces a capability.  6LRs that understand it may use th=
e
> >    new capability unilaterally if they understand it, and see a need fo=
r it.
> >    Nodes that do not understand the new capability are not affected.
> >    This could be a control plane thing, or a data plane thing.
> >
> > [RJ] The problem may be in the other direction, .. In storing MOP, how
> > should a 6LR which does not understand capability treat a DAO containin=
g
> capability?
> > Also how should a 6LR treat an unknown option in general?
> > 6550 mentions how to treat unknown RPL code but there is no handling
> > for unknown option in DIO/DAO. Is there? I searched and could not find.
> > Most of the existing implementations just ignore what they don't
> understand.
> >
> > 2) the root announces support for capability that it wishes to enable, =
in
> >    order for it be used, every node must support it.  If every DAO from
> >    every node supports the capability, then the root announces that it
> >    is turned on.
> >    This in effect is a two-pass system, requiring either two capability
> >    bits.
> >    It might be that it is better to encode these two bits are three
> >    values (plus 00-not supported).
> >
> > [RJ] Another scenario could be that Root announces support for an
> > optional capability. The 6LN just needs to know whether it could make
> > use of this capability of the root to do something. It may not need to
> > reply back to the root saying I see it and I support it.
> > Also should we be using two capability bits or we could use the info
> > on whether the bit is set in DIO/DAO to infer the direction.
> >
> > 3) any 6LR may announce a capability to it's children that it received =
from
> >    it's parent, if it understands that capability.  If it does not, the=
n
> >    it MUST clear the capability.
> >
> >    This can be a unilateral capability (like 1), or one that has to be
> >    confirmed (like 2).  So this is really 3A and 3B.
> > [RJ] I get 3A .. but do we really need 3B. I mean if the node also
> > needs to indicate that it also supports the same capability to the
> > root then it can set the same bit in the DAO and send it back ... Thus
> > working in both directions. It may not be required that capabilities
> > be handshaked in both directions mandatorily. For e.g., root may
> > indicate the capability that it has access to 6BBR and that unaware
> > leaves could register through 6LRs. Thus 6LRs could proxy the NS
> > (EARO) and other relevant messages. In this case, is it needed that 6LR=
 reply
> back to the root saying it supports unaware leaves?
> > There might be another example which requires 6LRs/6LNs to indicate in
> > the reply that it supports the feature asked by root using the same cap=
 bit in
> DAO.
> > The DIO/DAO decides the direction but the bit can be the same.
> >
> > 4) any 6LR may announce a capability to it's children, even if it did n=
ot
> >    receive it from a parent.  The capability is not to be repeated by
> >    the children (regardless of whether they understand it), unless they=
 also
> >    wish to enable it.
> > [RJ] agree
> >
> > I therefore see several issues to resolve.
> > For capabilities that a node understands, it can know which type of
> > capability it is.  For a capability that is unknown, if the behaviour
> > is other than "set to zero", then we need to tell the node what kind
> > of capability it is, and how it is encoded.
> >
> > Counting above, I see (1)-available, (2)-query, (2)-enable,
> > (3)-available, (3)- query, (3)-enable, (4)-available.  Conveniently, 7
> > things, plus all zeros.  We could encode capabilities in three bits,
> > so the behaviour would be part of the encoded.
> >
>=20
> Would you encode capabilities in a bit array?
> I'm interesting in signaling whether we can live without a capability or =
if it the
> node must become leaf if it does not have it.
>=20
> All the best
>=20
> Pascal
>=20
> > --
> > Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
> > - =3D IPv6 IoT consulting =3D-
> >
> > _______________________________________________
> > Roll mailing list
> > Roll@ietf.org
> > https://www.ietf.org/mailman/listinfo/roll


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Date: Mon, 02 Sep 2019 18:08:29 +0200
From: Peter van der Stok <stokcons@bbhmail.nl>
To: Alvaro Retana <aretana.ietf@gmail.com>
Cc: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, Routing Over Low power and Lossy networks <roll@ietf.org>, consultancy@vanderstok.org
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Subject: Re: [Roll] suggested addition to draft-ietf-roll-efficient-npdao
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--=_3b8ab727eabdf061430b06c9b1ab799d
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Pausing useofrplinfo also seems necessary.

Peter
Alvaro Retana schreef op 2019-08-30 20:13:

> On August 30, 2019 at 10:20:05 AM, Pascal Thubert (pthubert) (pthubert@cisco.com) wrote: 
> 
> Pascal: 
> 
>> The proposal does not change the behavior of the NPDAO but adds information about why the NPDAO is sent. Are you concerned by attacks like a cover channel? We could have one sentence on that but I'm unclear how to protect against it.
> 
> I haven't thought about it too long...but, yes, that could be one thing.  Not having a mitigation is ok, as  long as a potential vulnerability is explained.
> 
>> In the future status values that modify the behavior of NPDAO may be introduced. But for now we'd be looking at a very minimalistic change where the reserved field carries a RPL status that does not affect the behavior of the nodes. 
>> The hope would be that it does not affect the reviews that were already done.
> 
> I hope so too...but would have to see the scope of any change first. 
> 
> For now, I will ask the RFC Editor to pause processing. 
> 
> Thanks! 
> 
> Alvaro.
--=_3b8ab727eabdf061430b06c9b1ab799d
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html; charset=UTF-8

<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; charset=
=3DUTF-8" /></head><body style=3D'font-size: 10pt; font-family: Verdana,Gen=
eva,sans-serif'>
Pausing useofrplinfo also seems necessary.<br /><br />Peter<br />
<p>Alvaro Retana schreef op 2019-08-30 20:13:</p>
<blockquote type=3D"cite" style=3D"padding: 0 0.4em; border-left: #1010ff 2=
px solid; margin: 0"><!-- html ignored --><!-- head ignored --><!-- meta ig=
nored -->
<div style=3D"margin: 0px;"><span style=3D"font-family: Helvetica;">On Augu=
st 30, 2019 at 10:20:05 AM, Pascal Thubert (pthubert) (<a href=3D"mailto:pt=
hubert@cisco.com" rel=3D"noreferrer">pthubert@cisco.com</a>) wrote:</span><=
/div>
<div style=3D"margin: 0px;"><span style=3D"font-family: Helvetica;">&nbsp;<=
/span></div>
<div style=3D"margin: 0px;"><span style=3D"font-family: Helvetica;">Pascal:=
</span></div>
<div style=3D"margin: 0px;"><span style=3D"font-family: Helvetica;">&nbsp;<=
/span></div>
<div>
<blockquote class=3D"clean_bq" style=3D"font-variant-caps: normal; letter-s=
pacing: normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px;">
<div>
<div style=3D"color: #000000; font-variant-caps: normal; letter-spacing: no=
rmal; text-align: start; text-indent: 0px; text-transform: none; white-spac=
e: normal; word-spacing: 0px;"><span style=3D"font-family: Helvetica;">The =
proposal does not change the behavior of the NPDAO but adds information abo=
ut why the NPDAO is sent. Are you concerned by attacks like a cover channel=
? We could have one sentence on that but I'm unclear how to protect against=
 it.</span></div>
</div>
</blockquote>
</div>
<p><span style=3D"font-family: Helvetica;">I haven't thought about it too l=
ong...but, yes, that could be one thing.&nbsp; Not having a mitigation is o=
k, as &nbsp;long as a potential vulnerability is explained.</span></p>
<div>
<div>
<blockquote class=3D"clean_bq" style=3D"font-variant-caps: normal; letter-s=
pacing: normal; text-align: start; text-indent: 0px; text-transform: none; =
white-space: normal; word-spacing: 0px;">
<div style=3D"color: #000000; font-variant-caps: normal; letter-spacing: no=
rmal; text-align: start; text-indent: 0px; text-transform: none; white-spac=
e: normal; word-spacing: 0px;">In the future status values that modify the =
behavior of NPDAO may be introduced. But for now we'd be looking at a very =
minimalistic change where the reserved field carries a RPL status that does=
 not affect the behavior of the nodes.</div>
<div style=3D"color: #000000; font-variant-caps: normal; letter-spacing: no=
rmal; text-align: start; text-indent: 0px; text-transform: none; white-spac=
e: normal; word-spacing: 0px;">The hope would be that it does not affect th=
e reviews that were already done.</div>
</blockquote>
</div>
<p><span style=3D"font-family: Helvetica;">I hope so too...but would have t=
o see the scope of any change first.</span></p>
<p><span style=3D"font-family: Helvetica;">For now, I will ask the RFC Edit=
or to pause processing.</span></p>
<p><span style=3D"font-family: Helvetica;">Thanks!</span></p>
<p><span style=3D"font-family: Helvetica;">Alvaro.</span></p>
<div>&nbsp;</div>
<span style=3D"font-family: Helvetica;"></span></div>
<div class=3D"gmail_signature">&nbsp;</div>
</blockquote>
</body></html>

--=_3b8ab727eabdf061430b06c9b1ab799d--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Alvaro Retana <aretana.ietf@gmail.com>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>, "consultancy@vanderstok.org" <consultancy@vanderstok.org>
Thread-Topic: [Roll] suggested addition to draft-ietf-roll-efficient-npdao
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/QN6uM2FpsR-gnClQTxTi-sf-itg>
Subject: Re: [Roll] suggested addition to draft-ietf-roll-efficient-npdao
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Content-Type: application/octet-stream;
 name="draft-ietf-roll-efficient-npdao-16.patch"
Content-Description: draft-ietf-roll-efficient-npdao-16.patch
Content-Disposition: attachment;
 filename="draft-ietf-roll-efficient-npdao-16.patch"; size=9137;
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--_004_MN2PR11MB356522205DD441FF127611BFD8BE0MN2PR11MB3565namp_--


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Subject: Re: [Roll] do capabilities need to understood, can they be added?
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Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    pt> Seems to me that sometimes the capability of the node is something that
    pt> only the root cares about.

Yes, agreed.  This was my case (1), which I've brought up.

    >> 1) the root announces a capability.  6LRs that understand it may use the
    >> new capability unilaterally if they understand it, and see a need for it.
    >> Nodes that do not understand the new capability are not affected.
    >> This could be a control plane thing, or a data plane thing.

    pt> At least that's true when the root needs to know if all nodes support a
    pt> capability. It wants to flood a query and gather the responses from
    pt> all. Missing queries would mean a unicast retry I guess.

Agreed. That's my case (2).

    >> 2) the root announces support for capability that it wishes to enable, in
    >> order for it be used, every node must support it.  If every DAO from
    >> every node supports the capability, then the root announces that it
    >> is turned on.
    >> This in effect is a two-pass system, requiring either two capability
    >> bits.

Phase 1 is to learn whether all the nodes support it.
Phase 2 is to tell the nodes whether they can turn it on or not.
  draft-thubert-roll-turnon-rfc8138-03

could be done this way, btw.

    > At other times it might be something that the parent cares about. In
    > that case it asks one or all of its children.

Yes. That's my case (4).

    >> 4) any 6LR may announce a capability to it's children, even if it did not
    >> receive it from a parent.  The capability is not to be repeated by
    >> the children (regardless of whether they understand it), unless they also
    >> wish to enable it.

    > So we're after a capability exchange flow that is unicast or multicast,
    > with a unicast response. Either from parent to child or from root to
    > any. The flow would be independent of the storing vs. non-storing MOP.

Agreed.

    > We do not really have a flow like that in RPL. It's akin to a software
    > update, when the root wishes to now if all nodes have received the full
    > image.

So, you are suggesting that any reply from the nodes to the root shouldn't
use DAO, but something new.    I don't see why we can't put the downward
signal into the DIO though.

    > The DIO could be stretched to convey the ask to a group, but it's hard
    > to make it reliable. The DAO even less OK since it carries destination
    > not node information. As of today the root does not really know if
    > multiple addresses are on a same node.

    > All in all it seems that we are after something that is needed by RPL
    > but on the side of the current protocol. I'm not too sure that we
    > should overload the current messages for this. Rather, we may build new
    > objects for Nodes information and capability. Like a unicast or
    > multicast NIS (Node Info Solicitation) and a NAO (Node Advertisement
    > Object). We'd design operations that are independent of the current
    > MOPs. Note that we could use local broadcast NAO to discover siblings
    > and siblings siblings, something P DAO needs anyway.

I am for NAO as always being from node to root.
I see how we could do this multicast for P-DAO, but I think that I need to
know more.

--
Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
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Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    >>> *   Signal the capability by the root to proxy the EDAR in behalf of
    >>> the 6LR. Should we use the MOP draft or make it protocol independent
    >>> with 6CIO so any routing protocol could be used to proxy?
    >>
    >> I think we should use the root-announced (non-negotiated) capability.
    >>

    > Works for me

    >>> *   Impact on useofrplinfo: the change that the (E flag) =3D>
    >>> (non-storing signaling + tunnel to the 6LR)
    >>
    >> ....
    >>
    >>> Since those specs are not published yet, we could piggy-back the
    >>> changes there but that means taking the drafts off the RFC editor's
    >>> hands.
    >>
    >> I think that the useofrplinfo change affects only two (maybe) four o=
f the 24
    >> cases, and the case remains where we have an IPv6 Host only.
    >> So I think it is better to Updates: useofrplinfo.
    >>

    > Would you take the pen for this and the root capability? I=E2=80=99m =
looking at
    > the mop draft in parallel

To clarify:
My job is to document a capability (using mopex mechanism), in the
unaware-leaves document so that the root can announce that it can
process/proxy the EDAR.

=2D-
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 -=3D IPv6 IoT consulting =3D-




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Subject: Re: [Roll] do capabilities need to understood, can they be added?
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Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    > In addition to the below I took a refresh look at RFC 6551.

    > https://tools.ietf.org/html/rfc6551#section-3.1 provides a shell for capabilities such as those that we are after.
    > And
    > https://tools.ietf.org/html/rfc6551#section-3.2 discusses how to handle
    > a resource that varies over time and is subject to consumption and
    > exhaustion. Storage of routes for P-DAO has similarities with that.

    > All in all I'm thinking that we could extend Node Metric/Constraint
    > Objects and how they are used for DODAG formation. We could for
    > instance use the metric container as defined for DIO and create at
    > least one new message to report to the asker for the reasons below.

So, we'd (ab)use node metrics to provide information from children to parents
(and possibly to root) on what the node can do?

They (DAG Metric Containers) are options, and live in DIOs or DAOs, so would
still be limited as to how they flow up/down the DAG.  This just changes how
we encapsulate the options, but does not change the rules on where the information flows.

The point of introducing the NAO was that it would have different rules about
where it goes?

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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/7DwOv32MqqkYAkh1hA6PC47iShE>
Subject: [Roll] ROLL Interim Meeting - September
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Dear all,

We will host a ROLL Interim Meeting to discuss about capabilities and
status of NPDAO.

Please fill the doodle by this Friday 6th September.

https://doodle.com/poll/d3afe32xra2pg675

We will send more information later: agenda, etherpad for minutes, etc.

Let us know if you desire to discuss about additional topics or other dates
fits better for you (note that the interim meeting have to be announced two
weeks in advance [1])

Thank you,

Ines, Peter and Michael

[1] https://www.ietf.org/how/meetings/interim/

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<div dir=3D"ltr">Dear all,<br><div><br></div><div>We will host a ROLL Inter=
im Meeting to discuss about capabilities and status of NPDAO.</div><div><br=
></div><div>Please fill the doodle by this Friday 6th September.</div><div>=
<br></div><div><a href=3D"https://doodle.com/poll/d3afe32xra2pg675">https:/=
/doodle.com/poll/d3afe32xra2pg675</a><br></div><div><br></div><div>We will =
send more information later: agenda, etherpad for minutes, etc.</div><div><=
br></div><div>Let us know if you desire to discuss about additional topics =
or other dates fits better for you (note that the interim meeting have to b=
e announced two weeks in advance [1])</div><div><br></div><div>Thank you,</=
div><div><br></div><div>Ines, Peter and Michael</div><div><br></div><div>[1=
]=C2=A0<a href=3D"https://www.ietf.org/how/meetings/interim/">https://www.i=
etf.org/how/meetings/interim/</a></div><div><br></div><div><br></div></div>

--000000000000a5cc260591a0459b--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Published draft-ietf-roll-unaware-leaves-03
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Subject: Re: [Roll] Published draft-ietf-roll-unaware-leaves-03
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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Tue, 3 Sep 2019 13:55:19 +0300
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To: roll <roll@ietf.org>
Cc: peter van der Stok <consultancy@vanderstok.org>, Michael Richardson <mcr+ietf@sandelman.ca>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/lB3i1jbgoUzChi-1fG-eNCoZeM4>
Subject: Re: [Roll] ROLL Interim Meeting - September
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Dear all,

In this repository we will track the organization of the Interim meeting.

https://github.com/roll-wg/ROLL-Interim-Meeting

Thank you,

Ines.

On Tue, Sep 3, 2019 at 9:33 AM Ines Robles <mariainesrobles@googlemail.com>
wrote:

> Dear all,
>
> We will host a ROLL Interim Meeting to discuss about capabilities and
> status of NPDAO.
>
> Please fill the doodle by this Friday 6th September.
>
> https://doodle.com/poll/d3afe32xra2pg675
>
> We will send more information later: agenda, etherpad for minutes, etc.
>
> Let us know if you desire to discuss about additional topics or other
> dates fits better for you (note that the interim meeting have to be
> announced two weeks in advance [1])
>
> Thank you,
>
> Ines, Peter and Michael
>
> [1] https://www.ietf.org/how/meetings/interim/
>
>
>

--000000000000548d700591a3ed08
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<div dir=3D"ltr">Dear all,<br><div><br></div><div>In this repository we wil=
l track the organization of the Interim meeting.</div><div><br></div><div><=
a href=3D"https://github.com/roll-wg/ROLL-Interim-Meeting">https://github.c=
om/roll-wg/ROLL-Interim-Meeting</a><br></div><div><br></div><div>Thank you,=
</div><div><br></div><div>Ines.</div></div><br><div class=3D"gmail_quote"><=
div dir=3D"ltr" class=3D"gmail_attr">On Tue, Sep 3, 2019 at 9:33 AM Ines  R=
obles &lt;<a href=3D"mailto:mariainesrobles@googlemail.com">mariainesrobles=
@googlemail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex"><div dir=3D"ltr">Dear all,<br><div><br></div><div>We will ho=
st a ROLL Interim Meeting to discuss about capabilities and status of NPDAO=
.</div><div><br></div><div>Please fill the doodle by this Friday 6th Septem=
ber.</div><div><br></div><div><a href=3D"https://doodle.com/poll/d3afe32xra=
2pg675" target=3D"_blank">https://doodle.com/poll/d3afe32xra2pg675</a><br><=
/div><div><br></div><div>We will send more information later: agenda, ether=
pad for minutes, etc.</div><div><br></div><div>Let us know if you desire to=
 discuss about additional topics or other dates fits better for you (note t=
hat the interim meeting have to be announced two weeks in advance [1])</div=
><div><br></div><div>Thank you,</div><div><br></div><div>Ines, Peter and Mi=
chael</div><div><br></div><div>[1]=C2=A0<a href=3D"https://www.ietf.org/how=
/meetings/interim/" target=3D"_blank">https://www.ietf.org/how/meetings/int=
erim/</a></div><div><br></div><div><br></div></div>
</blockquote></div>

--000000000000548d700591a3ed08--


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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Tue, 3 Sep 2019 14:06:27 +0300
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To: Alvaro Retana <aretana.ietf@gmail.com>
Cc: Routing Over Low power and Lossy networks <roll@ietf.org>, peter van der Stok <consultancy@vanderstok.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/XlX0Eq92dPD9eLMp6ik94zKJmps>
Subject: Re: [Roll] suggested addition to draft-ietf-roll-efficient-npdao
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Yes, we should pause useofrplinfo as well.

Thank you,

Ines.

On Mon, Sep 2, 2019 at 7:08 PM Peter van der Stok <stokcons@bbhmail.nl>
wrote:

> Pausing useofrplinfo also seems necessary.
>
> Peter
>
> Alvaro Retana schreef op 2019-08-30 20:13:
>
> On August 30, 2019 at 10:20:05 AM, Pascal Thubert (pthubert) (
> pthubert@cisco.com) wrote:
>
> Pascal:
>
>
> The proposal does not change the behavior of the NPDAO but adds
> information about why the NPDAO is sent. Are you concerned by attacks like
> a cover channel? We could have one sentence on that but I'm unclear how to
> protect against it.
>
> I haven't thought about it too long...but, yes, that could be one thing.
> Not having a mitigation is ok, as  long as a potential vulnerability is
> explained.
>
> In the future status values that modify the behavior of NPDAO may be
> introduced. But for now we'd be looking at a very minimalistic change where
> the reserved field carries a RPL status that does not affect the behavior
> of the nodes.
> The hope would be that it does not affect the reviews that were already
> done.
>
> I hope so too...but would have to see the scope of any change first.
>
> For now, I will ask the RFC Editor to pause processing.
>
> Thanks!
>
> Alvaro.
>
>
>
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll
>

--0000000000002c18ad0591a415e6
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<div dir=3D"ltr"><div>Yes, we should pause useofrplinfo as well.</div><div>=
<br></div><div>Thank you,</div><div><br></div><div>Ines.</div><br><div clas=
s=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Sep 2, 2019=
 at 7:08 PM Peter van der Stok &lt;<a href=3D"mailto:stokcons@bbhmail.nl">s=
tokcons@bbhmail.nl</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex"><div style=3D"font-size:10pt;font-family:Verdana,Geneva,s=
ans-serif">
Pausing useofrplinfo also seems necessary.<br><br>Peter<br>
<p>Alvaro Retana schreef op 2019-08-30 20:13:</p>
<blockquote type=3D"cite" style=3D"padding:0px 0.4em;border-left:2px solid =
rgb(16,16,255);margin:0px">
<div style=3D"margin:0px"><span style=3D"font-family:Helvetica">On August 3=
0, 2019 at 10:20:05 AM, Pascal Thubert (pthubert) (<a href=3D"mailto:pthube=
rt@cisco.com" rel=3D"noreferrer" target=3D"_blank">pthubert@cisco.com</a>) =
wrote:</span></div>
<div style=3D"margin:0px"><span style=3D"font-family:Helvetica">=C2=A0</spa=
n></div>
<div style=3D"margin:0px"><span style=3D"font-family:Helvetica">Pascal:</sp=
an></div>
<div style=3D"margin:0px"><span style=3D"font-family:Helvetica">=C2=A0</spa=
n></div>
<div>
<blockquote class=3D"gmail-m_7207493687488298754clean_bq" style=3D"font-var=
iant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;tex=
t-transform:none;white-space:normal;word-spacing:0px">
<div>
<div style=3D"color:rgb(0,0,0);font-variant-caps:normal;letter-spacing:norm=
al;text-align:start;text-indent:0px;text-transform:none;white-space:normal;=
word-spacing:0px"><span style=3D"font-family:Helvetica">The proposal does n=
ot change the behavior of the NPDAO but adds information about why the NPDA=
O is sent. Are you concerned by attacks like a cover channel? We could have=
 one sentence on that but I&#39;m unclear how to protect against it.</span>=
</div>
</div>
</blockquote>
</div>
<p><span style=3D"font-family:Helvetica">I haven&#39;t thought about it too=
 long...but, yes, that could be one thing.=C2=A0 Not having a mitigation is=
 ok, as =C2=A0long as a potential vulnerability is explained.</span></p>
<div>
<div>
<blockquote class=3D"gmail-m_7207493687488298754clean_bq" style=3D"font-var=
iant-caps:normal;letter-spacing:normal;text-align:start;text-indent:0px;tex=
t-transform:none;white-space:normal;word-spacing:0px">
<div style=3D"color:rgb(0,0,0);font-variant-caps:normal;letter-spacing:norm=
al;text-align:start;text-indent:0px;text-transform:none;white-space:normal;=
word-spacing:0px">In the future status values that modify the behavior of N=
PDAO may be introduced. But for now we&#39;d be looking at a very minimalis=
tic change where the reserved field carries a RPL status that does not affe=
ct the behavior of the nodes.</div>
<div style=3D"color:rgb(0,0,0);font-variant-caps:normal;letter-spacing:norm=
al;text-align:start;text-indent:0px;text-transform:none;white-space:normal;=
word-spacing:0px">The hope would be that it does not affect the reviews tha=
t were already done.</div>
</blockquote>
</div>
<p><span style=3D"font-family:Helvetica">I hope so too...but would have to =
see the scope of any change first.</span></p>
<p><span style=3D"font-family:Helvetica">For now, I will ask the RFC Editor=
 to pause processing.</span></p>
<p><span style=3D"font-family:Helvetica">Thanks!</span></p>
<p><span style=3D"font-family:Helvetica">Alvaro.</span></p>
<div>=C2=A0</div>
<span style=3D"font-family:Helvetica"></span></div>
<div class=3D"gmail-m_7207493687488298754gmail_signature">=C2=A0</div>
</blockquote>
</div>
_______________________________________________<br>
Roll mailing list<br>
<a href=3D"mailto:Roll@ietf.org" target=3D"_blank">Roll@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/roll" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/roll</a><br>
</blockquote></div></div>

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+1 from my side!=20

Georgios

> On Aug 28, 2019, at 02:00, Rahul Arvind Jadhav =
<rahul.jadhav@huawei.com> wrote:
>=20
> +1.
> =20
> Min-priority is a scalar value for 6LRs/proxy to indicate its keenness =
to accept other nodes to join the network via it. There might be =
use-cases beyond join-proxy for using min-priority.
> =20
> Regards,
> Rahul
> =20
> From: Roll [mailto:roll-bounces@ietf.org] On Behalf Of Ines Robles
> Sent: 27 August 2019 15:37
> To: roll <roll@ietf.org>
> Subject: [Roll] WG adoption call for =
draft-richardson-6tisch-roll-enrollment-priority-02 - Extended
> =20
> Dear all,
> =20
> We extend this WG adoption call until 10 September.=20
> =20
> It would be nice to have your opinion on this.
> =20
> Thank you very much in advance,
> =20
> Ines and Peter.
> =20
> On Thu, Aug 8, 2019 at 4:19 PM Ines Robles =
<mariainesrobles@googlemail.com <mailto:mariainesrobles@googlemail.com>> =
wrote:
> Dear all,
> =20
> This is a call for WG adoption of the draft =
draft-richardson-6tisch-roll-enrollment-priority-02.
> =20
> The call starts today 08-08-2019 until 08-22-2019.
> =20
> Please let us know your opinion on this.
> =20
> Thank you in advance,
> =20
> Ines and Peter.
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll


--Apple-Mail=_D627E12C-FDCD-4D52-A1C4-7A348360F5B3
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">+1 from my side!&nbsp;<div class=3D""><br class=3D""></div><div=
 class=3D"">Georgios</div><div class=3D""><br class=3D""><div><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Aug 28, 2019, at 02:00, =
Rahul Arvind Jadhav &lt;<a href=3D"mailto:rahul.jadhav@huawei.com" =
class=3D"">rahul.jadhav@huawei.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;"><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">+1.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Min-priority is a =
scalar value for 6LRs/proxy to indicate its keenness to accept other =
nodes to join the network via it. There might be use-cases beyond =
join-proxy for using min-priority.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Regards,<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">Rahul<o:p class=3D""></o:p></span></div><div=
 style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D""><b class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">From:</span></b><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif;" =
class=3D""><span class=3D"Apple-converted-space">&nbsp;</span>Roll [<a =
href=3D"mailto:roll-bounces@ietf.org" =
class=3D"">mailto:roll-bounces@ietf.org</a>]<span =
class=3D"Apple-converted-space">&nbsp;</span><b class=3D"">On Behalf =
Of<span class=3D"Apple-converted-space">&nbsp;</span></b>Ines Robles<br =
class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>27 August 2019 15:37<br =
class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>roll &lt;<a =
href=3D"mailto:roll@ietf.org" class=3D"">roll@ietf.org</a>&gt;<br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>[Roll] WG adoption call for =
draft-richardson-6tisch-roll-enrollment-priority-02 - Extended<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0cm 0cm 0.0001pt; =
font-size: 12pt; font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div class=3D""><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Dear all,<o:p class=3D""></o:p></div><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">We extend this WG adoption call until 10 =
September.&nbsp;<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">It would be nice to have your opinion on this.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Thank you very much in advance,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Ines and Peter.<o:p =
class=3D""></o:p></div></div></div><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
class=3D""><div style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; =
font-family: 'Times New Roman', serif;" class=3D"">On Thu, Aug 8, 2019 =
at 4:19 PM Ines Robles &lt;<a =
href=3D"mailto:mariainesrobles@googlemail.com" style=3D"color: purple; =
text-decoration: underline;" =
class=3D"">mariainesrobles@googlemail.com</a>&gt; wrote:<o:p =
class=3D""></o:p></div></div><blockquote style=3D"border-style: none =
none none solid; border-left-color: rgb(204, 204, 204); =
border-left-width: 1pt; padding: 0cm 0cm 0cm 6pt; margin: 5pt 0cm 5pt =
4.8pt;" class=3D""><div class=3D""><div style=3D"margin: 0cm 0cm =
0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D"">Dear all,<o:p class=3D""></o:p></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">This is a call for WG adoption of the =
draft&nbsp;draft-richardson-6tisch-roll-enrollment-priority-02.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">The call starts today 08-08-2019 until =
08-22-2019.<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', =
serif;" class=3D"">Please let us know your opinion on this.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Thank you in advance,<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0cm =
0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif;" =
class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div class=3D""><div =
style=3D"margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times =
New Roman', serif;" class=3D"">Ines and Peter.<o:p =
class=3D""></o:p></div></div></div></blockquote></div></div></div><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" =
class=3D"">_______________________________________________</span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><span style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; =
float: none; display: inline !important;" class=3D"">Roll mailing =
list</span><br style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; orphans: auto; text-align: start; text-indent: =
0px; text-transform: none; white-space: normal; widows: auto; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D""><a href=3D"mailto:Roll@ietf.org" =
class=3D"">Roll@ietf.org</a></span><br style=3D"font-family: Helvetica; =
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A new meeting session request has just been submitted by Ines Robles, a Chair of the roll working group.


---------------------------------------------------------
Working Group Name: Routing Over Low power and Lossy networks
Area Name: Routing Area
Session Requester: Ines Robles

Number of Sessions: 2
Length of Session(s):  2 Hours, 2 Hours
Number of Attendees: 50
Conflicts to Avoid: 
 Chair Conflict: anima manet 6tisch core ace
 Technology Overlap: rtgarea 6lo 6man lwig cbor t2trg
 Key Participant Conflict: rtgwg intarea lpwan


People who must be present:
  Michael Richardson
  Peter van der Stok
  Alvaro Retana
  Ines Robles

Resources Requested:

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


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] do capabilities need to understood, can they be added?
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Subject: Re: [Roll] do capabilities need to understood, can they be added?
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Hello Michael and all

> The point of introducing the NAO was that it would have different rules
> about where it goes?

Yes. Thinking out loud:

What we have today
---------------------------

- DAG configuration information to signal activation of a feature as we bui=
ld a DAG are fine with a DIO and configuration option (e.g., flag day using=
 capability blah such as use RFC 8138 compression or place ROVR in DAO). It=
 could indicate, as RFC 6551 says, that " the constraint specified in the b=
ody of the object is optional". It is not as efficient as a global on/off s=
witch when all nodes need to act "transactionally", see the discussion in t=
urnon-rfc-8138 about turning off again. IOW, we do not have reliable-multic=
ast communication to set something on/off dynamically on all nodes.=20
- DAG constraints to build a DAG are fine in a DIO with a RFC 6551 Node Met=
ric/Constraint Objects in the DAG Metric Container Option. We could extend =
the Node State and Attribute (NSA) object to add constraints in capabilitie=
s (e.g., do not join as a router if you do not have capability blah such as=
 RFC 8138 compression). Note that RFC 6551 does not deal with "capabilities=
" but it discusses "characteristics" such as battery type and level.=20
- NSA in DIO could also be a vessel to disseminate DAG level capabilities i=
n addition to making them constraints as above (e.g., the capability to pro=
xy the EDAR at the Root for RUL could be exposed in the NSA as well). Once =
we used NSA to place constraints as well as expose some capabilities, it ma=
kes sense to use it in the capability query/response mechanism that we are =
after.
- DAO is not sequenced with / synchronized to DIO. There's a slight attempt=
 with DTSN but you cannot say I have all the DAOs from all nodes based on D=
IO blah. IOW DIO / DAO is not designed as an asynchronous query/response me=
chanism. Achieving something like DUAL in EIGRP looked too hard in an unrel=
iable / never converged LLN. Still does.

A new message model
------------------------------

I think the messages need to change because of different semantics and flow=
s. Semantics because we care about nodes as opposed to DAG (DIO) or Destina=
tions (DAO); think, like, in OSPF a Router LSA is different from a Link LSA=
.  And flows look different because we appear to need a reliable multicast,=
 either Root to all nodes or a parent to all its children. Today we do not =
have a message that a parent sends to all the children and it expects all t=
he children to answer. Because it's hard to do on a LLN. How do we know who=
 all the children are? How does the parent retry when 90% of the known chil=
dren have answered? A series of unicasts or a broadcast again? What about t=
he root?

Today a change in the configuration is trickled in DIOs that are propagated=
 down, which means it is slowly disseminated, it does not take effect quick=
ly to all, and it spreads. It eventually reaches all the live nodes but we =
do not know when. And DIO is about DAG.=20
But if we used DIO to query node capabilities, then we could not do unicast=
 retries hops away. DIO does not work like that. That's when it starts feel=
ing like an abuse. And trickling a new DIO to all because we are missing on=
e answer in the whole DODAG seems extreme. OTOH, a new Node Information Que=
ry that can be unicast, multicast one hop down or recursively all the way d=
own would do the trick. The query would indicate what the root (or parent) =
wants to know. It could even provide the value at the querier. The response=
 would be a unicast NAO.=20
We could even have a child use a NIQ unicast to a parent or the root, who w=
ould reply unicast to the querier or multicast NAO to all children. Parents=
 could aggregate NAOs for children towards the grandparent.

Diffusion like DUAL is probably still too hard, as it was when we designed =
DIO. We should probably shoot for something that hits most nodes, that is m=
ostly reliable. This generally works when turning something on like RFC 813=
8 compression. Those who did not see the knob do not compress but that work=
s. And then if really important find a way to unicast and then garage the n=
odes who did not respond. E.g., do not install P-DAO routes in nodes that d=
id not respond to capability queries.

A new container/option?
---------------------------------

I thought we could extend the existing Node Metric/Constraint objects to ad=
d capabilities but I'm not adamant about it. Just that there are things alr=
eady there and that we need. Like signaling constraints, whether they are m=
andatory or not, and describing node characteristics. The 'O'verload bit in=
 NSA looks like something we need to get inspiration from, though we need t=
o understand if the overload has to do with forwarding, Storing Mode routes=
, P-Dao states, or whatever else. The DAG Metric Container is really relate=
d to distributed routing decisions. We need to maintain a map of the DODAG =
with capabilities for centralized route computation P-DAO and the likes. It=
's a stretch, not a gigantic one.

The NIQ/NAO would transport the same NSAs. It would also produce neighborho=
od information, e.g. the number of P-DAO routes that can be stored - or jus=
t P-DAO storage "overload".

What do you think?

Pascal

> -----Original Message-----
> From: Roll <roll-bounces@ietf.org> On Behalf Of Michael Richardson
> Sent: lundi 2 septembre 2019 20:04
> To: Routing Over Low power and Lossy networks <roll@ietf.org>
> Subject: Re: [Roll] do capabilities need to understood, can they be added=
?
>=20
>=20
> Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
>     > In addition to the below I took a refresh look at RFC 6551.
>=20
>     > https://tools.ietf.org/html/rfc6551#section-3.1 provides a shell fo=
r
> capabilities such as those that we are after.
>     > And
>     > https://tools.ietf.org/html/rfc6551#section-3.2 discusses how to ha=
ndle
>     > a resource that varies over time and is subject to consumption and
>     > exhaustion. Storage of routes for P-DAO has similarities with that.
>=20
>     > All in all I'm thinking that we could extend Node Metric/Constraint
>     > Objects and how they are used for DODAG formation. We could for
>     > instance use the metric container as defined for DIO and create at
>     > least one new message to report to the asker for the reasons below.
>=20
> So, we'd (ab)use node metrics to provide information from children to
> parents (and possibly to root) on what the node can do?
>=20
> They (DAG Metric Containers) are options, and live in DIOs or DAOs, so
> would still be limited as to how they flow up/down the DAG.  This just
> changes how we encapsulate the options, but does not change the rules on
> where the information flows.
>=20
> The point of introducing the NAO was that it would have different rules
> about where it goes?
>=20
> --
> Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works
> -=3D IPv6 IoT consulting =3D-


From nobody Wed Sep  4 03:10:11 2019
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: giving back MPDAO to RFC editor
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Subject: [Roll] giving back MPDAO to RFC editor
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Dear all

We are holding NP DAO for a change that does not impact the behavior of the=
 node but improves traceability.
I would like to confirm consensus on this change rapidly so we can give the=
 doc back to RFC editor.

The proposed change is as follows:

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

diff --git "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll=
-efficient-npdao-15.xml" "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\d=
raft-ietf-roll-efficient-npdao-16.xml"
index 8a0acca..2ed0920 100644
--- "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effici=
ent-npdao-15.xml"
+++ "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effici=
ent-npdao-16.xml"
@@ -35,7 +35,7 @@
<?rfc subcompact=3D"yes" ?>
<!-- keep one blank line between list items -->
<!-- end of list of popular I-D processing instructions -->
-<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-15" ipr=
=3D"trust200902">
+<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-16" ipr=
=3D"trust200902">
   <!-- category values: std, bcp, info, exp, and historic
      ipr values: full3667, noModification3667, noDerivatives3667
      you can add the attributes updates=3D"NNNN" and obsoletes=3D"NNNN"
@@ -582,11 +582,12 @@

             <t>
                 This document specifies a change in the Transit Informatio=
n Option to
-                contain the "Invalidate previous route" (I) flag. This I-f=
lag signals
+                contain the "Invalidate previous route" (I) flag. This 'I'=
 flag signals
                 the common ancestor node to generate a DCO on behalf of th=
e
-                target node. The I-flag is carried in the Transit Informat=
ion
+                target node with a RPL Status of 130 indicating that the a=
ddress
+                has moved. The 'I' flag is carried in the Transit Informat=
ion
                 Option which augments the reachability information for a g=
iven
-                set of RPL Target(s). Transit Information Option with I-fl=
ag
+                set of RPL Target(s). Transit Information Option with 'I' =
flag
                 set should be carried in the DAO message when route
                 invalidation is sought for the corresponding target(s).
             </t>
@@ -615,8 +616,8 @@
             </t>
             <t>
                 The common ancestor node SHOULD generate a DCO message in
-                response to this I-flag when it sees that the routing
-                adjacencies have changed for the target. The I-flag is
+                response to this 'I' flag when it sees that the routing
+                adjacencies have changed for the target. The 'I' flag is
                 intended to give the target node control over its own rout=
e
                 invalidation, serving as a signal to request DCO generatio=
n.
             </t>
@@ -638,7 +639,7 @@
0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-| RPLInstanceID |K|D|   Flags   |   Reserved    | DCOSequence   |
+| RPLInstanceID |K|D|   Flags   |  RPL  Status  | DCOSequence   |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                                                               +
@@ -683,8 +684,15 @@
                 the sender and MUST be ignored by the receiver.
             </t>
             <t>
-                Reserved: 8-bit unused field. The field MUST be initialize=
d to
-                zero by the sender and MUST be ignored by the receiver.
+                RPL Status: The RPL Status as defined in section 6.5.1 of =
<xref
+                target=3D"RFC6550"/>.
+                Indicative of the reason why the DCO happened, the RPL Sta=
tus
+                MUST NOT be changed as the DCO is propagated down the rout=
e
+                being invalidated.
+                This value is informative and does not affect the behavior=
 of
+                the receiver. In particular, unknown values are ignored by=
 the
+                receiver.
+                Only Rejection Codes (value above 128) are expected in a D=
CO.
             </t>
             <t>
                 DCOSequence: 8-bit field incremented at each unique DCO me=
ssage
@@ -759,7 +767,7 @@
0                   1                   2                   3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-| RPLInstanceID |D|   Flags     |  DCOSequence  |    Status     |
+| RPLInstanceID |D|   Flags     |  DCOSequence  | DCO-ACK Status|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                                                               +
@@ -788,8 +796,10 @@
                     copied from the DCOSequence received in the DCO messag=
e.
                 </t>
                 <t>
-                    Status: Indicates the completion. Status 0 is defined =
as
-                    unqualified acceptance in this specification. Status 1=
 is
+                    DCO-ACK Status: Indicates the completion. A value of 0=
 is
+                    defined as
+                    unqualified acceptance in this specification. A value =
of 1
+                    is
                     defined as "No routing-entry for the Target found". Th=
e
                     remaining status values are reserved as rejection code=
s.
                 </t>
@@ -910,7 +920,7 @@
                     nodes will generate their respective DAOs to update th=
eir
                     paths, and the previous route invalidation for those n=
odes
                     should work in the similar manner described for switch=
ing
-                    node. The dependent node may set the I-flag in the Tra=
nsit
+                    node. The dependent node may set the 'I' flag in the T=
ransit
                     Information Option as part of regular DAO so as to
                     request invalidation of previous route from the common
                     ancestor node.
@@ -920,7 +930,7 @@
                     of their parents in turn have decided to switch their
                     parent. Thus for route invalidation the dependent node=
s may
                     choose to always set the 'I' flag in all its DAO messa=
ge's
-                    Transit Information Option. Note that setting the I-fl=
ag is
+                    Transit Information Option. Note that setting the 'I' =
flag is
                     not counterproductive even if there is no previous
                     route to be invalidated.
                 </t>
@@ -1103,7 +1113,7 @@

         <t>
             IANA is requested to allocate bit 1 from the Transit Informati=
on
-            Option Flags registry for the I-flag (<xref target=3D"transit_=
opt_changes"/>)
+            Option Flags registry for the 'I' flag (<xref target=3D"transi=
t_opt_changes"/>)
         </t>
         <section title=3D"New Registry for the Destination Cleanup Object =
(DCO) Flags">
             <t>
@@ -1210,22 +1220,29 @@
             This document introduces the ability for a common ancestor nod=
e to
             invalidate a route on behalf of the target node. The common
             ancestor node could be directed to do so by the target node us=
ing
-            the I-flag in DCO's Transit Information Option. However, the c=
ommon
+            the 'I' flag in DCO's Transit Information Option. However, the=
 common
             ancestor node is in a position to unilaterally initiate the ro=
ute
             invalidation since it possesses all the required state informa=
tion,
             namely, the Target address and the corresponding Path Sequence=
.
             Thus a rogue common ancestor node could initiate such an
            invalidation and impact the traffic to the target node.
         </t>
+        <t> The DCO carries a RPL Status value, which is informative. New =
Status
+            values may be created over time and a node will ignore an unkn=
own
+            Status value. Which makes it so that the RPL Status field may =
be
+            used as a cover channel. But the channel only works once since=
 the
+            message destroys its own medium, that is the existing route th=
at it
+            is removing.
+        </t>
         <t>
-            This document also introduces an I-flag which is set by the ta=
rget
+            This document also introduces an 'I' flag which is set by the =
target
             node and used by the ancestor node to initiate a DCO if the
             ancestor sees an update in the route adjacency. However,
             this flag could be spoofed by a malicious 6LR in the path and =
can
             cause invalidation of an existing active path. Note that inval=
idation
             will happen only if the other conditions such as Path Sequence
             condition is also met. Having said that, such a malicious 6LR =
may
-            spoof a DAO on behalf of the (sub) child with the I-flag set a=
nd
+            spoof a DAO on behalf of the (sub) child with the 'I' flag set=
 and
             can cause route invalidation on behalf of the (sub) child node=
.
             Note that, using existing mechanisms offered by <xref
                 target=3D"RFC6550"/>, a malicious 6LR might also spoof a D=
AO with


Chairs, could we please last call or whatever so we can move on?

Many thanks!

Pascal

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<p class=3D"MsoNormal"><span lang=3D"FR">Dear all<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal">We are holding NP DAO for a change that does not imp=
act the behavior of the node but improves traceability.<o:p></o:p></p>
<p class=3D"MsoNormal">I would like to confirm consensus on this change rap=
idly so we can give the doc back to RFC editor.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The proposed change is as follows:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">----------------------------------<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">diff --git &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc=
\\rpi\\draft-ietf-roll-efficient-npdao-15.xml&quot; &quot;b/C:\\Users\\pthu=
bert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot;=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">index 8a0acca..2ed0920 100644<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">--- &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\=
draft-ietf-roll-efficient-npdao-15.xml&quot;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&#43;&#43; &quot;b/C:\\Users\\pthubert\\Dropbox\\IETF=
\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -35,7 &#43;35,7 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&lt;?rfc subcompact=3D&quot;yes&quot; ?&gt;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&lt;!-- keep one blank line between list items --&gt;<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&lt;!-- end of list of popular I-D processing instructions=
 --&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&lt;rfc category=3D&quot;std&quot; docName=3D&quot;draft-=
ietf-roll-efficient-npdao-15&quot; ipr=3D&quot;trust200902&quot;&gt;<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&lt;rfc category=3D&quot;std&quot; docName=3D&quot;dr=
aft-ietf-roll-efficient-npdao-16&quot; ipr=3D&quot;trust200902&quot;&gt;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp; &lt;!-- category values: std, bcp, info, exp,=
 and historic<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ipr values: full3667, noMod=
ification3667, noDerivatives3667<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; you can add the attributes =
updates=3D&quot;NNNN&quot; and obsoletes=3D&quot;NNNN&quot;<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -582,11 &#43;582,12 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This document specifies a change in =
the Transit Information Option to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; contain the &quot;Invalidate previous rou=
te&quot; (I) flag. This I-flag signals<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; contain the &quot;Invalidate previous=
 route&quot; (I) flag. This 'I' flag signals<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the common ancestor node to generate=
 a DCO on behalf of the<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target node. The I-flag is carried in the=
 Transit Information<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target node with a RPL Status of 130 =
indicating that the address<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; has moved. The 'I' flag is carried in=
 the Transit Information<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Option which augments the reachabili=
ty information for a given<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set of RPL Target(s). Transit Information=
 Option with I-flag<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set of RPL Target(s). Transit Informa=
tion Option with 'I' flag<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set should be carried in the DAO mes=
sage when route<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; invalidation is sought for the corre=
sponding target(s).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;/t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -615,8 &#43;616,8 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;/t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The common ancestor node SHOULD gene=
rate a DCO message in<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; response to this I-flag when it sees that=
 the routing<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; adjacencies have changed for the target. =
The I-flag is<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; response to this 'I' flag when it see=
s that the routing<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; adjacencies have changed for the targ=
et. The 'I' flag is<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; intended to give the target node con=
trol over its own route<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; invalidation, serving as a signal to=
 request DCO generation.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;/t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -638,7 &#43;639,7 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 =
9 0 1<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&=
#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-| RPLInstanceID |K|D|&nbsp;&nbsp; Flags&nbsp;&nbsp; |&nbs=
p;&nbsp; Reserved&nbsp;&nbsp;&nbsp; | DCOSequence&nbsp;&nbsp; |<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;| RPLInstanceID |K|D|&nbsp;&nbsp; Flags&nbsp;&nbsp; |=
&nbsp; RPL&nbsp; Status&nbsp; | DCOSequence&nbsp;&nbsp; |<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&=
#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; |<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; &#43;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -683,8 &#43;684,15 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the sender and MUST be ignored by th=
e receiver.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;/t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Reserved: 8-bit unused field. The field M=
UST be initialized to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; zero by the sender and MUST be ignored by=
 the receiver.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RPL Status: The RPL Status as defined=
 in section 6.5.1 of &lt;xref<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target=3D&quot;RFC6550&quot;/&gt;.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Indicative of the reason why the DCO =
happened, the RPL Status<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MUST NOT be changed as the DCO is pro=
pagated down the route<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; being invalidated.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This value is informative and does no=
t affect the behavior of<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the receiver. In particular, unknown =
values are ignored by the<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; receiver.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Only Rejection Codes (value above 128=
) are expected in a DCO.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;/t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DCOSequence: 8-bit field incremented=
 at each unique DCO message<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -759,7 &#43;767,7 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 =
9 0 1<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&=
#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-| RPLInstanceID |D|&nbsp;&nbsp; Flags&nbsp;&nbsp;&nbsp;&n=
bsp; |&nbsp; DCOSequence&nbsp; |&nbsp;&nbsp;&nbsp; Status&nbsp;&nbsp;&nbsp;=
&nbsp; |<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;| RPLInstanceID |D|&nbsp;&nbsp; Flags&nbsp;&nbsp;&nbs=
p;&nbsp; |&nbsp; DCOSequence&nbsp; | DCO-ACK Status|<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&=
#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; |<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp; &#43;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -788,8 &#43;796,10 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from =
the DCOSequence received in the DCO message.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Status: Indicates=
 the completion. Status 0 is defined as<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unqualified accep=
tance in this specification. Status 1 is<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DCO-ACK Statu=
s: Indicates the completion. A value of 0 is<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; defined as<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unqualified a=
cceptance in this specification. A value of 1<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; is<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;defined as &=
quot;No routing-entry for the Target found&quot;. The<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; remaining st=
atus values are reserved as rejection codes.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -910,7 &#43;920,7 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nodes will g=
enerate their respective DAOs to update their<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; paths, and t=
he previous route invalidation for those nodes<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; should work =
in the similar manner described for switching<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; node. The depende=
nt node may set the I-flag in the Transit<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;node. The dep=
endent node may set the 'I' flag in the Transit<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Information =
Option as part of regular DAO so as to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; request inva=
lidation of previous route from the common<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ancestor nod=
e.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -920,7 &#43;930,7 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; of their par=
ents in turn have decided to switch their<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; parent. Thus=
 for route invalidation the dependent nodes may<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; choose to al=
ways set the 'I' flag in all its DAO message's<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transit Informati=
on Option. Note that setting the I-flag is<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Transit Infor=
mation Option. Note that setting the 'I' flag is<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; not counterp=
roductive even if there is no previous<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; route to be =
invalidated.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -1103,7 &#43;1113,7 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt;=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; IANA is requested to allocate bit 1 from the Transit Informa=
tion<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">- &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;Option Flags registry for the I-flag (&lt;xref target=3D&quot;tra=
nsit_opt_changes&quot;/&gt;)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; Option Flags registry for the 'I' flag (&lt;xref target=3D&qu=
ot;transit_opt_changes&quot;/&gt;)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;secti=
on title=3D&quot;New Registry for the Destination Cleanup Object (DCO) Flag=
s&quot;&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &lt;t&gt;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">@@ -1210,22 &#43;1220,29 @@<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; This document introduces the ability for a common ancestor n=
ode to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; invalidate a route on behalf of the target node. The common<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; ancestor node could be directed to do so by the target node =
using<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; the I-flag in DCO's Transit Information Option. However, the comm=
on<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; the 'I' flag in DCO's Transit Information Option. However, th=
e common<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; ancestor node is in a position to unilaterally initiate the =
route<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; invalidation since it possesses all the required state infor=
mation,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; namely, the Target address and the corresponding Path Sequen=
ce.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Thus a rogue common ancestor node could initiate such an<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;invalidation and impact the traffic to the target node.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt; =
The DCO carries a RPL Status value, which is informative. New Status<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; values may be created over time and a node will ignore an unk=
nown<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; Status value. Which makes it so that the RPL Status field may=
 be<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; used as a cover channel. But the channel only works once sinc=
e the<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; message destroys its own medium, that is the existing route t=
hat it<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; is removing.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt;=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; This document also introduces an I-flag which is set by the targe=
t<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; This document also introduces an 'I' flag which is set by the=
 target<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; node and used by the ancestor node to initiate a DCO if the<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; ancestor sees an update in the route adjacency. However,<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; this flag could be spoofed by a malicious 6LR in the path an=
d can<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; cause invalidation of an existing active path. Note that inv=
alidation<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; will happen only if the other conditions such as Path Sequen=
ce<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; condition is also met. Having said that, such a malicious 6L=
R may<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; spoof a DAO on behalf of the (sub) child with the I-flag set and<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; spoof a DAO on behalf of the (sub) child with the 'I' flag se=
t and<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; can cause route invalidation on behalf of the (sub) child no=
de.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Note that, using existing mechanisms offered by &lt;xref<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target=3D&quot;RFC6550&quot;/&gt;, a=
 malicious 6LR might also spoof a DAO with<o:p></o:p></span></p>
<div style=3D"mso-element:para-border-div;border:none;border-bottom:solid w=
indowtext 1.0pt;padding:0cm 0cm 1.0pt 0cm">
<p class=3D"MsoNormal" style=3D"border:none;padding:0cm"><o:p>&nbsp;</o:p><=
/p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Chairs, could we please last call or whatever so we =
can move on?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Many thanks!<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
</body>
</html>

--_000_MN2PR11MB3565DAEEF4DD78D732EDE17DD8B80MN2PR11MB3565namp_--


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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Wed, 4 Sep 2019 13:33:48 +0300
Message-ID: <CAP+sJUc+UMsqDQvyc1kaM8zNmq43jB9zNRXZ7eijyB9XjcomiQ@mail.gmail.com>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: peter van der Stok <consultancy@vanderstok.org>, roll <roll@ietf.org>
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Subject: Re: [Roll] giving back MPDAO to RFC editor
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Hi Pascal,

Thank you very much for your hard work.

Could you please convert the draft-ietf-roll-efficient-npdao-16.xml to txt [
https://xml2rfc.tools.ietf.org/] and put them here
https://github.com/roll-wg/efficient-route-invalidation, so people can read
the complete document with the proposed changes, thus we can have a last
call.

Many thanks again,

Ines and Peter.



On Wed, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthubert) <pthubert@cisco.com>
wrote:

> Dear all
>
>
>
> We are holding NP DAO for a change that does not impact the behavior of
> the node but improves traceability.
>
> I would like to confirm consensus on this change rapidly so we can give
> the doc back to RFC editor.
>
>
>
> The proposed change is as follows:
>
>
>
> ----------------------------------
>
>
>
> diff --git
> "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-15.xml"
> "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml"
>
> index 8a0acca..2ed0920 100644
>
> ---
> "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-15.xml"
>
> +++
> "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml"
>
> @@ -35,7 +35,7 @@
>
> <?rfc subcompact="yes" ?>
>
> <!-- keep one blank line between list items -->
>
> <!-- end of list of popular I-D processing instructions -->
>
> -<rfc category="std" docName="draft-ietf-roll-efficient-npdao-15"
> ipr="trust200902">
>
> +<rfc category="std" docName="draft-ietf-roll-efficient-npdao-16"
> ipr="trust200902">
>
>    <!-- category values: std, bcp, info, exp, and historic
>
>       ipr values: full3667, noModification3667, noDerivatives3667
>
>       you can add the attributes updates="NNNN" and obsoletes="NNNN"
>
> @@ -582,11 +582,12 @@
>
>
>
>              <t>
>
>                  This document specifies a change in the Transit
> Information Option to
>
> -                contain the "Invalidate previous route" (I) flag. This
> I-flag signals
>
> +                contain the "Invalidate previous route" (I) flag. This
> 'I' flag signals
>
>                  the common ancestor node to generate a DCO on behalf of
> the
>
> -                target node. The I-flag is carried in the Transit
> Information
>
> +                target node with a RPL Status of 130 indicating that the
> address
>
> +                has moved. The 'I' flag is carried in the Transit
> Information
>
>                  Option which augments the reachability information for a
> given
>
> -                set of RPL Target(s). Transit Information Option with
> I-flag
>
> +                set of RPL Target(s). Transit Information Option with 'I'
> flag
>
>                  set should be carried in the DAO message when route
>
>                  invalidation is sought for the corresponding target(s).
>
>              </t>
>
> @@ -615,8 +616,8 @@
>
>              </t>
>
>              <t>
>
>                  The common ancestor node SHOULD generate a DCO message in
>
> -                response to this I-flag when it sees that the routing
>
> -                adjacencies have changed for the target. The I-flag is
>
> +                response to this 'I' flag when it sees that the routing
>
> +                adjacencies have changed for the target. The 'I' flag is
>
>                  intended to give the target node control over its own
> route
>
>                  invalidation, serving as a signal to request DCO
> generation.
>
>              </t>
>
> @@ -638,7 +639,7 @@
>
> 0                   1                   2                   3
>
> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> -| RPLInstanceID |K|D|   Flags   |   Reserved    | DCOSequence   |
>
> +| RPLInstanceID |K|D|   Flags   |  RPL  Status  | DCOSequence   |
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> |                                                               |
>
> +                                                               +
>
> @@ -683,8 +684,15 @@
>
>                  the sender and MUST be ignored by the receiver.
>
>              </t>
>
>              <t>
>
> -                Reserved: 8-bit unused field. The field MUST be
> initialized to
>
> -                zero by the sender and MUST be ignored by the receiver.
>
> +                RPL Status: The RPL Status as defined in section 6.5.1 of
> <xref
>
> +                target="RFC6550"/>.
>
> +                Indicative of the reason why the DCO happened, the RPL
> Status
>
> +                MUST NOT be changed as the DCO is propagated down the
> route
>
> +                being invalidated.
>
> +                This value is informative and does not affect the
> behavior of
>
> +                the receiver. In particular, unknown values are ignored
> by the
>
> +                receiver.
>
> +                Only Rejection Codes (value above 128) are expected in a
> DCO.
>
>              </t>
>
>              <t>
>
>                  DCOSequence: 8-bit field incremented at each unique DCO
> message
>
> @@ -759,7 +767,7 @@
>
> 0                   1                   2                   3
>
> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> -| RPLInstanceID |D|   Flags     |  DCOSequence  |    Status     |
>
> +| RPLInstanceID |D|   Flags     |  DCOSequence  | DCO-ACK Status|
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> |                                                               |
>
> +                                                               +
>
> @@ -788,8 +796,10 @@
>
>                      copied from the DCOSequence received in the DCO
> message.
>
>                  </t>
>
>                  <t>
>
> -                    Status: Indicates the completion. Status 0 is defined
> as
>
> -                    unqualified acceptance in this specification. Status
> 1 is
>
> +                    DCO-ACK Status: Indicates the completion. A value of
> 0 is
>
> +                    defined as
>
> +                    unqualified acceptance in this specification. A value
> of 1
>
> +                    is
>
>                      defined as "No routing-entry for the Target found".
> The
>
>                      remaining status values are reserved as rejection
> codes.
>
>                  </t>
>
> @@ -910,7 +920,7 @@
>
>                      nodes will generate their respective DAOs to update
> their
>
>                      paths, and the previous route invalidation for those
> nodes
>
>                      should work in the similar manner described for
> switching
>
> -                    node. The dependent node may set the I-flag in the
> Transit
>
> +                    node. The dependent node may set the 'I' flag in the
> Transit
>
>                      Information Option as part of regular DAO so as to
>
>                      request invalidation of previous route from the common
>
>                      ancestor node.
>
> @@ -920,7 +930,7 @@
>
>                      of their parents in turn have decided to switch their
>
>                      parent. Thus for route invalidation the dependent
> nodes may
>
>                      choose to always set the 'I' flag in all its DAO
> message's
>
> -                    Transit Information Option. Note that setting the
> I-flag is
>
> +                    Transit Information Option. Note that setting the 'I'
> flag is
>
>                      not counterproductive even if there is no previous
>
>                      route to be invalidated.
>
>                  </t>
>
> @@ -1103,7 +1113,7 @@
>
>
>
>          <t>
>
>              IANA is requested to allocate bit 1 from the Transit
> Information
>
> -            Option Flags registry for the I-flag (<xref
> target="transit_opt_changes"/>)
>
> +            Option Flags registry for the 'I' flag (<xref
> target="transit_opt_changes"/>)
>
>          </t>
>
>          <section title="New Registry for the Destination Cleanup Object
> (DCO) Flags">
>
>              <t>
>
> @@ -1210,22 +1220,29 @@
>
>              This document introduces the ability for a common ancestor
> node to
>
>              invalidate a route on behalf of the target node. The common
>
>              ancestor node could be directed to do so by the target node
> using
>
> -            the I-flag in DCO's Transit Information Option. However, the
> common
>
> +            the 'I' flag in DCO's Transit Information Option. However,
> the common
>
>              ancestor node is in a position to unilaterally initiate the
> route
>
>              invalidation since it possesses all the required state
> information,
>
>              namely, the Target address and the corresponding Path
> Sequence.
>
>              Thus a rogue common ancestor node could initiate such an
>
>             invalidation and impact the traffic to the target node.
>
>          </t>
>
> +        <t> The DCO carries a RPL Status value, which is informative. New
> Status
>
> +            values may be created over time and a node will ignore an
> unknown
>
> +            Status value. Which makes it so that the RPL Status field may
> be
>
> +            used as a cover channel. But the channel only works once
> since the
>
> +            message destroys its own medium, that is the existing route
> that it
>
> +            is removing.
>
> +        </t>
>
>          <t>
>
> -            This document also introduces an I-flag which is set by the
> target
>
> +            This document also introduces an 'I' flag which is set by the
> target
>
>              node and used by the ancestor node to initiate a DCO if the
>
>              ancestor sees an update in the route adjacency. However,
>
>              this flag could be spoofed by a malicious 6LR in the path and
> can
>
>              cause invalidation of an existing active path. Note that
> invalidation
>
>              will happen only if the other conditions such as Path Sequence
>
>              condition is also met. Having said that, such a malicious 6LR
> may
>
> -            spoof a DAO on behalf of the (sub) child with the I-flag set
> and
>
> +            spoof a DAO on behalf of the (sub) child with the 'I' flag
> set and
>
>              can cause route invalidation on behalf of the (sub) child
> node.
>
>              Note that, using existing mechanisms offered by <xref
>
>                  target="RFC6550"/>, a malicious 6LR might also spoof a
> DAO with
>
>
>
>
>
> Chairs, could we please last call or whatever so we can move on?
>
>
>
> Many thanks!
>
>
>
> Pascal
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll
>

--00000000000039c21a0591b7befb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Pascal,<div><br></div><div>Thank you very much for your=
 hard work.=C2=A0</div><div><br></div><div>Could you please convert the=C2=
=A0<span style=3D"font-family:&quot;Courier New&quot;;font-size:13.3333px">=
draft-ietf-roll-efficient-</span><span style=3D"font-family:&quot;Courier N=
ew&quot;;font-size:13.3333px">npdao-16.xml to txt [</span><a href=3D"https:=
//xml2rfc.tools.ietf.org/">https://xml2rfc.tools.ietf.org/</a><span style=
=3D"font-family:&quot;Courier New&quot;;font-size:13.3333px">] and put them=
 here=C2=A0</span><a href=3D"https://github.com/roll-wg/efficient-route-inv=
alidation">https://github.com/roll-wg/efficient-route-invalidation</a><span=
 style=3D"font-family:&quot;Courier New&quot;;font-size:13.3333px">, so peo=
ple can read the complete document with the proposed changes, thus we can h=
ave a last call.</span></div><div><span style=3D"font-family:&quot;Courier =
New&quot;;font-size:13.3333px"><br></span></div><div><span style=3D"font-fa=
mily:&quot;Courier New&quot;;font-size:13.3333px">Many thanks again,</span>=
</div><div><span style=3D"font-family:&quot;Courier New&quot;;font-size:13.=
3333px"><br></span></div><div><span style=3D"font-family:&quot;Courier New&=
quot;;font-size:13.3333px">Ines and Peter.</span></div><div><span style=3D"=
font-family:&quot;Courier New&quot;;font-size:13.3333px"><br></span></div><=
div><span style=3D"font-family:&quot;Courier New&quot;;font-size:13.3333px"=
>=C2=A0</span></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" c=
lass=3D"gmail_attr">On Wed, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthubert=
) &lt;<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>&gt; wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_-2457782833319735188WordSection1">
<p class=3D"MsoNormal"><span lang=3D"FR">Dear all<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">We are holding NP DAO for a change that does not imp=
act the behavior of the node but improves traceability.<u></u><u></u></p>
<p class=3D"MsoNormal">I would like to confirm consensus on this change rap=
idly so we can give the doc back to RFC editor.
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">The proposed change is as follows:<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">----------------------------------<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">diff --git &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\=
rpi\\draft-ietf-roll-efficient-npdao-15.xml&quot; &quot;b/C:\\Users\\pthube=
rt\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot;<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">index 8a0acca..2ed0920 100644<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">--- &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\dr=
aft-ietf-roll-efficient-npdao-15.xml&quot;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+++ &quot;b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\dr=
aft-ietf-roll-efficient-npdao-16.xml&quot;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -35,7 +35,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">&lt;?rfc subcompact=3D&quot;yes&quot; ?&gt;<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">&lt;!-- keep one blank line between list items --&gt;<u></u>=
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">&lt;!-- end of list of popular I-D processing instructions -=
-&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-&lt;rfc category=3D&quot;std&quot; docName=3D&quot;draft-ie=
tf-roll-efficient-npdao-15&quot; ipr=3D&quot;trust200902&quot;&gt;<u></u><u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+&lt;rfc category=3D&quot;std&quot; docName=3D&quot;draft-ie=
tf-roll-efficient-npdao-16&quot; ipr=3D&quot;trust200902&quot;&gt;<u></u><u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0 &lt;!-- category values: std, bcp, info, exp, a=
nd historic<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ipr values: full3667, noModif=
ication3667, noDerivatives3667<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 you can add the attributes up=
dates=3D&quot;NNNN&quot; and obsoletes=3D&quot;NNNN&quot;<u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -582,11 +582,12 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This document specifies a change in th=
e Transit Information Option to<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 contain the &quot;Invalidate previous rou=
te&quot; (I) flag. This I-flag signals<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 contain the &quot;Invalidate previous rou=
te&quot; (I) flag. This &#39;I&#39; flag signals<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the common ancestor node to generate a=
 DCO on behalf of the<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 target node. The I-flag is carried in the=
 Transit Information<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0target node with a RPL Status of 130 indic=
ating that the address<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 has moved. The &#39;I&#39; flag is carrie=
d in the Transit Information<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Option which augments the reachability=
 information for a given<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 set of RPL Target(s). Transit Information=
 Option with I-flag<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 set of RPL Target(s). Transit Information=
 Option with &#39;I&#39; flag<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 set should be carried in the DAO messa=
ge when route<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 invalidation is sought for the corresp=
onding target(s).<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -615,8 +616,8 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 The common ancestor node SHOULD genera=
te a DCO message in<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 response to this I-flag when it sees that=
 the routing<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 adjacencies have changed for the target. =
The I-flag is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 response to this &#39;I&#39; flag when it=
 sees that the routing<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 adjacencies have changed for the target. =
The &#39;I&#39; flag is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 intended to give the target node contr=
ol over its own route<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 invalidation, serving as a signal to r=
equest DCO generation.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -638,7 +639,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 =
0 1<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-| RPLInstanceID |K|D|=C2=A0=C2=A0 Flags=C2=A0=C2=A0 |=C2=A0=
=C2=A0 Reserved=C2=A0=C2=A0=C2=A0 | DCOSequence=C2=A0=C2=A0 |<u></u><u></u>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+| RPLInstanceID |K|D|=C2=A0=C2=A0 Flags=C2=A0=C2=A0 |=C2=A0=
 RPL=C2=A0 Status=C2=A0 | DCOSequence=C2=A0=C2=A0 |<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 |<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 +<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -683,8 +684,15 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the sender and MUST be ignored by the =
receiver.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Reserved: 8-bit unused field. The field M=
UST be initialized to<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 zero by the sender and MUST be ignored by=
 the receiver.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 RPL Status: The RPL Status as defined in =
section 6.5.1 of &lt;xref<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 target=3D&quot;RFC6550&quot;/&gt;.<u></u>=
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Indicative of the reason why the DCO happ=
ened, the RPL Status<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 MUST NOT be changed as the DCO is propaga=
ted down the route<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 being invalidated.<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This value is informative and does not af=
fect the behavior of<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the receiver. In particular, unknown valu=
es are ignored by the<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 receiver.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Only Rejection Codes (value above 128) ar=
e expected in a DCO.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 DCOSequence: 8-bit field incremented a=
t each unique DCO message<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -759,7 +767,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 =
0 1<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-| RPLInstanceID |D|=C2=A0=C2=A0 Flags=C2=A0=C2=A0=C2=A0=C2=
=A0 |=C2=A0 DCOSequence=C2=A0 |=C2=A0=C2=A0=C2=A0 Status=C2=A0=C2=A0=C2=A0=
=C2=A0 |<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+| RPLInstanceID |D|=C2=A0=C2=A0 Flags=C2=A0=C2=A0=C2=A0=C2=
=A0 |=C2=A0 DCOSequence=C2=A0 | DCO-ACK Status|<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 |<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 +<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -788,8 +796,10 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 copied from th=
e DCOSequence received in the DCO message.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Status: Indicates=
 the completion. Status 0 is defined as<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unqualified accep=
tance in this specification. Status 1 is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 DCO-ACK Status: I=
ndicates the completion. A value of 0 is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 defined as<u></u>=
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unqualified accep=
tance in this specification. A value of 1<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 is<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0defined as &qu=
ot;No routing-entry for the Target found&quot;. The<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 remaining stat=
us values are reserved as rejection codes.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -910,7 +920,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 nodes will gen=
erate their respective DAOs to update their<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 paths, and the=
 previous route invalidation for those nodes<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 should work in=
 the similar manner described for switching<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 node. The depende=
nt node may set the I-flag in the Transit<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0node. The depende=
nt node may set the &#39;I&#39; flag in the Transit<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Information Op=
tion as part of regular DAO so as to<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 request invali=
dation of previous route from the common<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ancestor node.=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -920,7 +930,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 of their paren=
ts in turn have decided to switch their<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 parent. Thus f=
or route invalidation the dependent nodes may<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 choose to alwa=
ys set the &#39;I&#39; flag in all its DAO message&#39;s<u></u><u></u></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Transit Informatio=
n Option. Note that setting the I-flag is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Transit Informati=
on Option. Note that setting the &#39;I&#39; flag is<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 not counterpro=
ductive even if there is no previous<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 route to be in=
validated.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -1103,7 +1113,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;t&gt;<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 IANA is requested to allocate bit 1 from the Transit Informati=
on<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">- =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0Option Flags registry for the I-flag (&lt;xref target=3D&quot;tran=
sit_opt_changes&quot;/&gt;)<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 Option Flags registry for the &#39;I&#39; flag (&lt;xref target=
=3D&quot;transit_opt_changes&quot;/&gt;)<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;section=
 title=3D&quot;New Registry for the Destination Cleanup Object (DCO) Flags&=
quot;&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -1210,22 +1220,29 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 This document introduces the ability for a common ancestor nod=
e to<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 invalidate a route on behalf of the target node. The common<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 ancestor node could be directed to do so by the target node us=
ing<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 the I-flag in DCO&#39;s Transit Information Option. However, the =
common<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 the &#39;I&#39; flag in DCO&#39;s Transit Information Option. How=
ever, the common<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 ancestor node is in a position to unilaterally initiate the ro=
ute<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 invalidation since it possesses all the required state informa=
tion,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 namely, the Target address and the corresponding Path Sequence=
.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 Thus a rogue common ancestor node could initiate such an<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0invalidation and impact the traffic to the target node.<u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;t&gt; The DC=
O carries a RPL Status value, which is informative. New Status<u></u><u></u=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 values may be created over time and a node will ignore an unknown=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 Status value. Which makes it so that the RPL Status field may be<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 used as a cover channel. But the channel only works once since th=
e<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 message destroys its own medium, that is the existing route that =
it<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 is removing.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;t&gt;<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 This document also introduces an I-flag which is set by the targe=
t<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 This document also introduces an &#39;I&#39; flag which is set by=
 the target<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 node and used by the ancestor node to initiate a DCO if the<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 ancestor sees an update in the route adjacency. However,<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 this flag could be spoofed by a malicious 6LR in the path and =
can<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 cause invalidation of an existing active path. Note that inval=
idation<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 will happen only if the other conditions such as Path Sequence=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 condition is also met. Having said that, such a malicious 6LR =
may<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 spoof a DAO on behalf of the (sub) child with the I-flag set and<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 spoof a DAO on behalf of the (sub) child with the &#39;I&#39; fla=
g set and<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 can cause route invalidation on behalf of the (sub) child node=
.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 Note that, using existing mechanisms offered by &lt;xref<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 target=3D&quot;RFC6550&quot;/&gt;, a m=
alicious 6LR might also spoof a DAO with<u></u><u></u></span></p>
<div style=3D"border-top:none;border-right:none;border-left:none;border-bot=
tom:1pt solid windowtext;padding:0cm 0cm 1pt">
<p class=3D"MsoNormal" style=3D"border:none;padding:0cm"><u></u>=C2=A0<u></=
u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Chairs, could we please last call or whatever so we =
can move on?<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Many thanks!<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Pascal<u></u><u></u></p>
</div>
</div>

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

--00000000000039c21a0591b7befb--


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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Wed, 4 Sep 2019 17:02:35 +0300
Message-ID: <CAP+sJUeEWC-bhw2U0t82-45ha3vOEcuqiD9U4Hmc-xR=y6PM6w@mail.gmail.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/zhkJiPRrhLm1qfk71j6G6ei3EN8>
Subject: [Roll] Last call to draft-ietf-roll-efficient-npdao-16
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Dear all,

This is a last call for the modified NPDAO document (version 16) that you
can find here

https://github.com/pthubert/efficient-route-invalidation/blob/master/draft-ietf-roll-efficient-npdao.txt

This call is open until 23th September. Please let us know your opinion.

Thank you very much in advance,

Ines and Peter.

On Wed, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthubert) <pthubert@cisco.com>
wrote:

> Dear all
>
>
>
> We are holding NP DAO for a change that does not impact the behavior of
> the node but improves traceability.
>
> I would like to confirm consensus on this change rapidly so we can give
> the doc back to RFC editor.
>
>
>
> The proposed change is as follows:
>
>
>
> ----------------------------------
>
>
>
> diff --git
> "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-15.xml"
> "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml"
>
> index 8a0acca..2ed0920 100644
>
> ---
> "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-15.xml"
>
> +++
> "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml"
>
> @@ -35,7 +35,7 @@
>
> <?rfc subcompact="yes" ?>
>
> <!-- keep one blank line between list items -->
>
> <!-- end of list of popular I-D processing instructions -->
>
> -<rfc category="std" docName="draft-ietf-roll-efficient-npdao-15"
> ipr="trust200902">
>
> +<rfc category="std" docName="draft-ietf-roll-efficient-npdao-16"
> ipr="trust200902">
>
>    <!-- category values: std, bcp, info, exp, and historic
>
>       ipr values: full3667, noModification3667, noDerivatives3667
>
>       you can add the attributes updates="NNNN" and obsoletes="NNNN"
>
> @@ -582,11 +582,12 @@
>
>
>
>              <t>
>
>                  This document specifies a change in the Transit
> Information Option to
>
> -                contain the "Invalidate previous route" (I) flag. This
> I-flag signals
>
> +                contain the "Invalidate previous route" (I) flag. This
> 'I' flag signals
>
>                  the common ancestor node to generate a DCO on behalf of
> the
>
> -                target node. The I-flag is carried in the Transit
> Information
>
> +                target node with a RPL Status of 130 indicating that the
> address
>
> +                has moved. The 'I' flag is carried in the Transit
> Information
>
>                  Option which augments the reachability information for a
> given
>
> -                set of RPL Target(s). Transit Information Option with
> I-flag
>
> +                set of RPL Target(s). Transit Information Option with 'I'
> flag
>
>                  set should be carried in the DAO message when route
>
>                  invalidation is sought for the corresponding target(s).
>
>              </t>
>
> @@ -615,8 +616,8 @@
>
>              </t>
>
>              <t>
>
>                  The common ancestor node SHOULD generate a DCO message in
>
> -                response to this I-flag when it sees that the routing
>
> -                adjacencies have changed for the target. The I-flag is
>
> +                response to this 'I' flag when it sees that the routing
>
> +                adjacencies have changed for the target. The 'I' flag is
>
>                  intended to give the target node control over its own
> route
>
>                  invalidation, serving as a signal to request DCO
> generation.
>
>              </t>
>
> @@ -638,7 +639,7 @@
>
> 0                   1                   2                   3
>
> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> -| RPLInstanceID |K|D|   Flags   |   Reserved    | DCOSequence   |
>
> +| RPLInstanceID |K|D|   Flags   |  RPL  Status  | DCOSequence   |
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> |                                                               |
>
> +                                                               +
>
> @@ -683,8 +684,15 @@
>
>                  the sender and MUST be ignored by the receiver.
>
>              </t>
>
>              <t>
>
> -                Reserved: 8-bit unused field. The field MUST be
> initialized to
>
> -                zero by the sender and MUST be ignored by the receiver.
>
> +                RPL Status: The RPL Status as defined in section 6.5.1 of
> <xref
>
> +                target="RFC6550"/>.
>
> +                Indicative of the reason why the DCO happened, the RPL
> Status
>
> +                MUST NOT be changed as the DCO is propagated down the
> route
>
> +                being invalidated.
>
> +                This value is informative and does not affect the
> behavior of
>
> +                the receiver. In particular, unknown values are ignored
> by the
>
> +                receiver.
>
> +                Only Rejection Codes (value above 128) are expected in a
> DCO.
>
>              </t>
>
>              <t>
>
>                  DCOSequence: 8-bit field incremented at each unique DCO
> message
>
> @@ -759,7 +767,7 @@
>
> 0                   1                   2                   3
>
> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> -| RPLInstanceID |D|   Flags     |  DCOSequence  |    Status     |
>
> +| RPLInstanceID |D|   Flags     |  DCOSequence  | DCO-ACK Status|
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> |                                                               |
>
> +                                                               +
>
> @@ -788,8 +796,10 @@
>
>                      copied from the DCOSequence received in the DCO
> message.
>
>                  </t>
>
>                  <t>
>
> -                    Status: Indicates the completion. Status 0 is defined
> as
>
> -                    unqualified acceptance in this specification. Status
> 1 is
>
> +                    DCO-ACK Status: Indicates the completion. A value of
> 0 is
>
> +                    defined as
>
> +                    unqualified acceptance in this specification. A value
> of 1
>
> +                    is
>
>                      defined as "No routing-entry for the Target found".
> The
>
>                      remaining status values are reserved as rejection
> codes.
>
>                  </t>
>
> @@ -910,7 +920,7 @@
>
>                      nodes will generate their respective DAOs to update
> their
>
>                      paths, and the previous route invalidation for those
> nodes
>
>                      should work in the similar manner described for
> switching
>
> -                    node. The dependent node may set the I-flag in the
> Transit
>
> +                    node. The dependent node may set the 'I' flag in the
> Transit
>
>                      Information Option as part of regular DAO so as to
>
>                      request invalidation of previous route from the common
>
>                      ancestor node.
>
> @@ -920,7 +930,7 @@
>
>                      of their parents in turn have decided to switch their
>
>                      parent. Thus for route invalidation the dependent
> nodes may
>
>                      choose to always set the 'I' flag in all its DAO
> message's
>
> -                    Transit Information Option. Note that setting the
> I-flag is
>
> +                    Transit Information Option. Note that setting the 'I'
> flag is
>
>                      not counterproductive even if there is no previous
>
>                      route to be invalidated.
>
>                  </t>
>
> @@ -1103,7 +1113,7 @@
>
>
>
>          <t>
>
>              IANA is requested to allocate bit 1 from the Transit
> Information
>
> -            Option Flags registry for the I-flag (<xref
> target="transit_opt_changes"/>)
>
> +            Option Flags registry for the 'I' flag (<xref
> target="transit_opt_changes"/>)
>
>          </t>
>
>          <section title="New Registry for the Destination Cleanup Object
> (DCO) Flags">
>
>              <t>
>
> @@ -1210,22 +1220,29 @@
>
>              This document introduces the ability for a common ancestor
> node to
>
>              invalidate a route on behalf of the target node. The common
>
>              ancestor node could be directed to do so by the target node
> using
>
> -            the I-flag in DCO's Transit Information Option. However, the
> common
>
> +            the 'I' flag in DCO's Transit Information Option. However,
> the common
>
>              ancestor node is in a position to unilaterally initiate the
> route
>
>              invalidation since it possesses all the required state
> information,
>
>              namely, the Target address and the corresponding Path
> Sequence.
>
>              Thus a rogue common ancestor node could initiate such an
>
>             invalidation and impact the traffic to the target node.
>
>          </t>
>
> +        <t> The DCO carries a RPL Status value, which is informative. New
> Status
>
> +            values may be created over time and a node will ignore an
> unknown
>
> +            Status value. Which makes it so that the RPL Status field may
> be
>
> +            used as a cover channel. But the channel only works once
> since the
>
> +            message destroys its own medium, that is the existing route
> that it
>
> +            is removing.
>
> +        </t>
>
>          <t>
>
> -            This document also introduces an I-flag which is set by the
> target
>
> +            This document also introduces an 'I' flag which is set by the
> target
>
>              node and used by the ancestor node to initiate a DCO if the
>
>              ancestor sees an update in the route adjacency. However,
>
>              this flag could be spoofed by a malicious 6LR in the path and
> can
>
>              cause invalidation of an existing active path. Note that
> invalidation
>
>              will happen only if the other conditions such as Path Sequence
>
>              condition is also met. Having said that, such a malicious 6LR
> may
>
> -            spoof a DAO on behalf of the (sub) child with the I-flag set
> and
>
> +            spoof a DAO on behalf of the (sub) child with the 'I' flag
> set and
>
>              can cause route invalidation on behalf of the (sub) child
> node.
>
>              Note that, using existing mechanisms offered by <xref
>
>                  target="RFC6550"/>, a malicious 6LR might also spoof a
> DAO with
>
>
>
>
>
> Chairs, could we please last call or whatever so we can move on?
>
>
>
> Many thanks!
>
>
>
> Pascal
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll
>

--000000000000e3dee00591baa852
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Dear all,</div><div><br></div><div>This is a last cal=
l for the modified NPDAO document (version 16) that you can find here</div>=
<div><br></div><div><a href=3D"https://github.com/pthubert/efficient-route-=
invalidation/blob/master/draft-ietf-roll-efficient-npdao.txt">https://githu=
b.com/pthubert/efficient-route-invalidation/blob/master/draft-ietf-roll-eff=
icient-npdao.txt</a><br></div><div><br></div><div>This call is open until 2=
3th September. Please let us know your opinion.</div><div><br></div><div>Th=
ank you very much in advance,</div><div><br></div><div>Ines and Peter.</div=
><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On We=
d, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthubert) &lt;<a href=3D"mailto:p=
thubert@cisco.com">pthubert@cisco.com</a>&gt; wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_-2457782833319735188WordSection1">
<p class=3D"MsoNormal"><span lang=3D"FR">Dear all<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">We are holding NP DAO for a change that does not imp=
act the behavior of the node but improves traceability.<u></u><u></u></p>
<p class=3D"MsoNormal">I would like to confirm consensus on this change rap=
idly so we can give the doc back to RFC editor.
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">The proposed change is as follows:<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">----------------------------------<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">diff --git &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\=
rpi\\draft-ietf-roll-efficient-npdao-15.xml&quot; &quot;b/C:\\Users\\pthube=
rt\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot;<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">index 8a0acca..2ed0920 100644<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">--- &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\dr=
aft-ietf-roll-efficient-npdao-15.xml&quot;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+++ &quot;b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\dr=
aft-ietf-roll-efficient-npdao-16.xml&quot;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -35,7 +35,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">&lt;?rfc subcompact=3D&quot;yes&quot; ?&gt;<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">&lt;!-- keep one blank line between list items --&gt;<u></u>=
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">&lt;!-- end of list of popular I-D processing instructions -=
-&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-&lt;rfc category=3D&quot;std&quot; docName=3D&quot;draft-ie=
tf-roll-efficient-npdao-15&quot; ipr=3D&quot;trust200902&quot;&gt;<u></u><u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+&lt;rfc category=3D&quot;std&quot; docName=3D&quot;draft-ie=
tf-roll-efficient-npdao-16&quot; ipr=3D&quot;trust200902&quot;&gt;<u></u><u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0 &lt;!-- category values: std, bcp, info, exp, a=
nd historic<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ipr values: full3667, noModif=
ication3667, noDerivatives3667<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 you can add the attributes up=
dates=3D&quot;NNNN&quot; and obsoletes=3D&quot;NNNN&quot;<u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -582,11 +582,12 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This document specifies a change in th=
e Transit Information Option to<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 contain the &quot;Invalidate previous rou=
te&quot; (I) flag. This I-flag signals<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 contain the &quot;Invalidate previous rou=
te&quot; (I) flag. This &#39;I&#39; flag signals<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the common ancestor node to generate a=
 DCO on behalf of the<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 target node. The I-flag is carried in the=
 Transit Information<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0target node with a RPL Status of 130 indic=
ating that the address<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 has moved. The &#39;I&#39; flag is carrie=
d in the Transit Information<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Option which augments the reachability=
 information for a given<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 set of RPL Target(s). Transit Information=
 Option with I-flag<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 set of RPL Target(s). Transit Information=
 Option with &#39;I&#39; flag<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 set should be carried in the DAO messa=
ge when route<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 invalidation is sought for the corresp=
onding target(s).<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -615,8 +616,8 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 The common ancestor node SHOULD genera=
te a DCO message in<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 response to this I-flag when it sees that=
 the routing<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 adjacencies have changed for the target. =
The I-flag is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 response to this &#39;I&#39; flag when it=
 sees that the routing<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 adjacencies have changed for the target. =
The &#39;I&#39; flag is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 intended to give the target node contr=
ol over its own route<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 invalidation, serving as a signal to r=
equest DCO generation.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -638,7 +639,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 =
0 1<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-| RPLInstanceID |K|D|=C2=A0=C2=A0 Flags=C2=A0=C2=A0 |=C2=A0=
=C2=A0 Reserved=C2=A0=C2=A0=C2=A0 | DCOSequence=C2=A0=C2=A0 |<u></u><u></u>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+| RPLInstanceID |K|D|=C2=A0=C2=A0 Flags=C2=A0=C2=A0 |=C2=A0=
 RPL=C2=A0 Status=C2=A0 | DCOSequence=C2=A0=C2=A0 |<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 |<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 +<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -683,8 +684,15 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the sender and MUST be ignored by the =
receiver.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Reserved: 8-bit unused field. The field M=
UST be initialized to<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 zero by the sender and MUST be ignored by=
 the receiver.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 RPL Status: The RPL Status as defined in =
section 6.5.1 of &lt;xref<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 target=3D&quot;RFC6550&quot;/&gt;.<u></u>=
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Indicative of the reason why the DCO happ=
ened, the RPL Status<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 MUST NOT be changed as the DCO is propaga=
ted down the route<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 being invalidated.<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 This value is informative and does not af=
fect the behavior of<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 the receiver. In particular, unknown valu=
es are ignored by the<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 receiver.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Only Rejection Codes (value above 128) ar=
e expected in a DCO.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 DCOSequence: 8-bit field incremented a=
t each unique DCO message<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -759,7 +767,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 2=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 =
0 1<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-| RPLInstanceID |D|=C2=A0=C2=A0 Flags=C2=A0=C2=A0=C2=A0=C2=
=A0 |=C2=A0 DCOSequence=C2=A0 |=C2=A0=C2=A0=C2=A0 Status=C2=A0=C2=A0=C2=A0=
=C2=A0 |<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+| RPLInstanceID |D|=C2=A0=C2=A0 Flags=C2=A0=C2=A0=C2=A0=C2=
=A0 |=C2=A0 DCOSequence=C2=A0 | DCO-ACK Status|<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-=
+-+-+<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">|=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 |<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 +<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -788,8 +796,10 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 copied from th=
e DCOSequence received in the DCO message.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Status: Indicates=
 the completion. Status 0 is defined as<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unqualified accep=
tance in this specification. Status 1 is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 DCO-ACK Status: I=
ndicates the completion. A value of 0 is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 defined as<u></u>=
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 unqualified accep=
tance in this specification. A value of 1<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 is<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0defined as &qu=
ot;No routing-entry for the Target found&quot;. The<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 remaining stat=
us values are reserved as rejection codes.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -910,7 +920,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 nodes will gen=
erate their respective DAOs to update their<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 paths, and the=
 previous route invalidation for those nodes<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 should work in=
 the similar manner described for switching<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 node. The depende=
nt node may set the I-flag in the Transit<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0node. The depende=
nt node may set the &#39;I&#39; flag in the Transit<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Information Op=
tion as part of regular DAO so as to<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 request invali=
dation of previous route from the common<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 ancestor node.=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -920,7 +930,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 of their paren=
ts in turn have decided to switch their<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 parent. Thus f=
or route invalidation the dependent nodes may<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 choose to alwa=
ys set the &#39;I&#39; flag in all its DAO message&#39;s<u></u><u></u></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Transit Informatio=
n Option. Note that setting the I-flag is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Transit Informati=
on Option. Note that setting the &#39;I&#39; flag is<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 not counterpro=
ductive even if there is no previous<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 route to be in=
validated.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -1103,7 +1113,7 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;t&gt;<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 IANA is requested to allocate bit 1 from the Transit Informati=
on<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">- =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0Option Flags registry for the I-flag (&lt;xref target=3D&quot;tran=
sit_opt_changes&quot;/&gt;)<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 Option Flags registry for the &#39;I&#39; flag (&lt;xref target=
=3D&quot;transit_opt_changes&quot;/&gt;)<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;section=
 title=3D&quot;New Registry for the Destination Cleanup Object (DCO) Flags&=
quot;&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">@@ -1210,22 +1220,29 @@<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 This document introduces the ability for a common ancestor nod=
e to<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 invalidate a route on behalf of the target node. The common<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 ancestor node could be directed to do so by the target node us=
ing<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 the I-flag in DCO&#39;s Transit Information Option. However, the =
common<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 the &#39;I&#39; flag in DCO&#39;s Transit Information Option. How=
ever, the common<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 ancestor node is in a position to unilaterally initiate the ro=
ute<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 invalidation since it possesses all the required state informa=
tion,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 namely, the Target address and the corresponding Path Sequence=
.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 Thus a rogue common ancestor node could initiate such an<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0invalidation and impact the traffic to the target node.<u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;t&gt; The DC=
O carries a RPL Status value, which is informative. New Status<u></u><u></u=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 values may be created over time and a node will ignore an unknown=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 Status value. Which makes it so that the RPL Status field may be<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 used as a cover channel. But the channel only works once since th=
e<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 message destroys its own medium, that is the existing route that =
it<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 is removing.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;/t&gt;<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 &lt;t&gt;<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 This document also introduces an I-flag which is set by the targe=
t<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 This document also introduces an &#39;I&#39; flag which is set by=
 the target<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 node and used by the ancestor node to initiate a DCO if the<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 ancestor sees an update in the route adjacency. However,<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 this flag could be spoofed by a malicious 6LR in the path and =
can<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 cause invalidation of an existing active path. Note that inval=
idation<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 will happen only if the other conditions such as Path Sequence=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 condition is also met. Having said that, such a malicious 6LR =
may<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">-=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 spoof a DAO on behalf of the (sub) child with the I-flag set and<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">+=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 spoof a DAO on behalf of the (sub) child with the &#39;I&#39; fla=
g set and<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 can cause route invalidation on behalf of the (sub) child node=
.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 Note that, using existing mechanisms offered by &lt;xref<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 target=3D&quot;RFC6550&quot;/&gt;, a m=
alicious 6LR might also spoof a DAO with<u></u><u></u></span></p>
<div style=3D"border-top:none;border-right:none;border-left:none;border-bot=
tom:1pt solid windowtext;padding:0cm 0cm 1pt">
<p class=3D"MsoNormal" style=3D"border:none;padding:0cm"><u></u>=C2=A0<u></=
u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Chairs, could we please last call or whatever so we =
can move on?<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Many thanks!<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Pascal<u></u><u></u></p>
</div>
</div>

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

--000000000000e3dee00591baa852--


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: MOP value calculation with MOPex
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Subject: Re: [Roll] MOP value calculation with MOPex
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Dear all

Please see below

All the best,

Pascal

From: Roll <roll-bounces@ietf.org> On Behalf Of Rahul Arvind Jadhav

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

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

  1.  Reuse all the values in base MOP. We do not lose a single value i.e.,=
 there is no MOP value reserved for extn. If base MOP value is 7 and if MOP=
ex is absent then the final MOP is 7.
  2.  When anyone references a MOP value X, it need not be referred to in c=
ontext to base MOP or extended MOP. For e.g., when we say MOP=3D11 ... ther=
e will be only one Mode of Operation it refers to and need not be specified=
 in the context of base or extended MOP.
Essentially we keep using the base MOP and add up from MOPex (if present) t=
o derive final MOP.


?    My reasoning was that like the configuration option, the MOP > 7 could=
 be elided, IOW not repeated upon every DIO. So we can place the MOPex in t=
he config option if we liked. So 7 would mean, the MOP is elsewhere, wheree=
ver we decide that is.

How will the implementation handle it?

  1.  Process DIO base object and get the base MOP.
  2.  Keep processing DIO Options and on encountering MOPex add the MOPex v=
alue to the same var in step 1.
  3.  At the end of DIO message processing check if the node supports MOP.


?    It really matters if it is the first DIO the node sees for that instan=
ce.  If that is the case the node needs the config option and the DAG Metri=
c Containers to figure if it can participate as a router, as a leaf or not =
at all. If those are elided, e.g., because the network has been stable, I g=
uess the node should DIS to get them. Note that it is an intention that the=
 MOP does not change on the fly. So once the MOP has been seen it can be re=
membered.

Section 3.2. makes it clear that if base MOP is 7 and MOPex is not present =
then the final MOP is 7.


?    I'd like to change that to say that means it is in the MOPex. No MOPex=
 means elided, if the node already has it then no problem. The processing b=
ecomes much easier since there is no addition to make.

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


?    That could be a backward compatibility problem. Say the MOP says 2 and=
 the MOPex says 12. A lecacy node that ignores MOPex will use the wrong val=
ue. OTOH a legacy node that does not understand 7 will join as leaf.

All the best

Pascal


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<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please see below<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">All the best,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<p class=3D"MsoNormal"><b>From:</b> Roll &lt;roll-bounces@ietf.org&gt; <b>O=
n Behalf Of </b>
Rahul Arvind Jadhav<br>
<br>
<o:p></o:p></p>
<p class=3D"MsoNormal">During ROLL session, it was suggested that using &#8=
220;Final MOP =3D Base MOP &#43; MOPex&#8221; may not be a good idea, since=
 the implementation becomes more complex.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">My initial reasoning behind using such a scheme/calc=
ulation was to:<o:p></o:p></p>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"a">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo2">Reuse all the values in base MOP. We do not lose a single value i.e.,=
 there is no MOP value reserved for extn. If base MOP value is 7 and if MOP=
ex is absent then the final MOP is 7.
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso=
-list:l0 level1 lfo2">When anyone references a MOP value X, it need not be =
referred to in context to base MOP or extended MOP. For e.g., when we say M=
OP=3D11 &#8230; there will be only one Mode of Operation it
 refers to and need not be specified in the context of base or extended MOP=
.<o:p></o:p></li></ol>
<p class=3D"MsoNormal">Essentially we keep using the base MOP and add up fr=
om MOPex (if present) to derive final MOP.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:0cm;text-indent:0cm;mso-=
list:l2 level1 lfo5">
<![if !supportLists]><span style=3D"font-family:Wingdings"><span style=3D"m=
so-list:Ignore">&Oslash;<span style=3D"font:7.0pt &quot;Times New Roman&quo=
t;">&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>My reasoning was that like the configuration=
 option, the MOP &gt; 7 could be elided, IOW not repeated upon every DIO. S=
o we can place the MOPex in the config option if we liked. So 7 would mean,=
 the MOP is elsewhere, whereever we
 decide that is.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">How will the implementation handle it?<o:p></o:p></p=
>
<ol style=3D"margin-top:0cm" start=3D"1" type=3D"1">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l1 level1 =
lfo4">Process DIO base object and get the base MOP.<o:p></o:p></li><li clas=
s=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l1 level1 lfo4">Ke=
ep processing DIO Options and on encountering MOPex add the MOPex value to =
the same var in step 1.<o:p></o:p></li><li class=3D"MsoListParagraph" style=
=3D"margin-left:0cm;mso-list:l1 level1 lfo4">At the end of DIO message proc=
essing check if the node supports MOP.<o:p></o:p></li></ol>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:0cm;text-indent:0cm;mso-=
list:l2 level1 lfo5">
<![if !supportLists]><span style=3D"font-family:Wingdings"><span style=3D"m=
so-list:Ignore">&Oslash;<span style=3D"font:7.0pt &quot;Times New Roman&quo=
t;">&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>It really matters if it is the first DIO the=
 node sees for that instance. &nbsp;If that is the case the node needs the =
config option and the DAG Metric Containers to figure if it can participate=
 as a router, as a leaf or not at all.
 If those are elided, e.g., because the network has been stable, I guess th=
e node should DIS to get them. Note that it is an intention that the MOP do=
es not change on the fly. So once the MOP has been seen it can be remembere=
d.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Section 3.2. makes it clear that if base MOP is 7 an=
d MOPex is not present then the final MOP is 7.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:0cm;text-indent:0cm;mso-=
list:l2 level1 lfo5">
<![if !supportLists]><span style=3D"font-family:Wingdings"><span style=3D"m=
so-list:Ignore">&Oslash;<span style=3D"font:7.0pt &quot;Times New Roman&quo=
t;">&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>I&#8217;d like to change that to say that me=
ans it is in the MOPex. No MOPex means elided, if the node already has it t=
hen no problem. The processing becomes much easier since there is no additi=
on to make.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Another way of handling this would be, If MOPex is p=
resent then ignore base MOP and just use the value of MOPex as MOP. In this=
 case we will lose out on 7 values of mop.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:0cm;text-indent:0cm;mso-=
list:l2 level1 lfo5">
<![if !supportLists]><span style=3D"font-family:Wingdings"><span style=3D"m=
so-list:Ignore">&Oslash;<span style=3D"font:7.0pt &quot;Times New Roman&quo=
t;">&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>That could be a backward compatibility probl=
em. Say the MOP says 2 and the MOPex says 12. A lecacy node that ignores MO=
Pex will use the wrong value. OTOH a legacy node that does not understand 7=
 will join as leaf.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">All the best<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</body>
</html>

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From: Rahul Jadhav <nyrahul@outlook.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Last call to draft-ietf-roll-efficient-npdao-16
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Subject: Re: [Roll] Last call to draft-ietf-roll-efficient-npdao-16
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Hi Pascal,

The new text contains "RPL status code of 130 indicating that the address i=
s moved". It has no reference and no IANA consideration. Is it ok to simply=
 state this without explicit IANA consideration? Maybe I am just not aware =
of such procedural aspects of status code allocation, but how would a futur=
e work avoid using this value?

Regards,
Rahul

________________________________
From: Roll <roll-bounces@ietf.org> on behalf of Ines Robles <mariainesroble=
s=3D40googlemail.com@dmarc.ietf.org>
Sent: Wednesday, September 4, 2019 2:02 PM
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Subject: [Roll] Last call to draft-ietf-roll-efficient-npdao-16

Dear all,

This is a last call for the modified NPDAO document (version 16) that you c=
an find here

https://github.com/pthubert/efficient-route-invalidation/blob/master/draft-=
ietf-roll-efficient-npdao.txt

This call is open until 23th September. Please let us know your opinion.

Thank you very much in advance,

Ines and Peter.

On Wed, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthubert) <pthubert@cisco.co=
m<mailto:pthubert@cisco.com>> wrote:

Dear all



We are holding NP DAO for a change that does not impact the behavior of the=
 node but improves traceability.

I would like to confirm consensus on this change rapidly so we can give the=
 doc back to RFC editor.



The proposed change is as follows:



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



diff --git "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll=
-efficient-npdao-15.xml" "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\d=
raft-ietf-roll-efficient-npdao-16.xml"

index 8a0acca..2ed0920 100644

--- "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effici=
ent-npdao-15.xml"

+++ "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effici=
ent-npdao-16.xml"

@@ -35,7 +35,7 @@

<?rfc subcompact=3D"yes" ?>

<!-- keep one blank line between list items -->

<!-- end of list of popular I-D processing instructions -->

-<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-15" ipr=
=3D"trust200902">

+<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-16" ipr=
=3D"trust200902">

   <!-- category values: std, bcp, info, exp, and historic

      ipr values: full3667, noModification3667, noDerivatives3667

      you can add the attributes updates=3D"NNNN" and obsoletes=3D"NNNN"

@@ -582,11 +582,12 @@



             <t>

                 This document specifies a change in the Transit Informatio=
n Option to

-                contain the "Invalidate previous route" (I) flag. This I-f=
lag signals

+                contain the "Invalidate previous route" (I) flag. This 'I'=
 flag signals

                 the common ancestor node to generate a DCO on behalf of th=
e

-                target node. The I-flag is carried in the Transit Informat=
ion

+                target node with a RPL Status of 130 indicating that the a=
ddress

+                has moved. The 'I' flag is carried in the Transit Informat=
ion

                 Option which augments the reachability information for a g=
iven

-                set of RPL Target(s). Transit Information Option with I-fl=
ag

+                set of RPL Target(s). Transit Information Option with 'I' =
flag

                 set should be carried in the DAO message when route

                 invalidation is sought for the corresponding target(s).

             </t>

@@ -615,8 +616,8 @@

             </t>

             <t>

                 The common ancestor node SHOULD generate a DCO message in

-                response to this I-flag when it sees that the routing

-                adjacencies have changed for the target. The I-flag is

+                response to this 'I' flag when it sees that the routing

+                adjacencies have changed for the target. The 'I' flag is

                 intended to give the target node control over its own rout=
e

                 invalidation, serving as a signal to request DCO generatio=
n.

             </t>

@@ -638,7 +639,7 @@

0                   1                   2                   3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

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

-| RPLInstanceID |K|D|   Flags   |   Reserved    | DCOSequence   |

+| RPLInstanceID |K|D|   Flags   |  RPL  Status  | DCOSequence   |

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

|                                                               |

+                                                               +

@@ -683,8 +684,15 @@

                 the sender and MUST be ignored by the receiver.

             </t>

             <t>

-                Reserved: 8-bit unused field. The field MUST be initialize=
d to

-                zero by the sender and MUST be ignored by the receiver.

+                RPL Status: The RPL Status as defined in section 6.5.1 of =
<xref

+                target=3D"RFC6550"/>.

+                Indicative of the reason why the DCO happened, the RPL Sta=
tus

+                MUST NOT be changed as the DCO is propagated down the rout=
e

+                being invalidated.

+                This value is informative and does not affect the behavior=
 of

+                the receiver. In particular, unknown values are ignored by=
 the

+                receiver.

+                Only Rejection Codes (value above 128) are expected in a D=
CO.

             </t>

             <t>

                 DCOSequence: 8-bit field incremented at each unique DCO me=
ssage

@@ -759,7 +767,7 @@

0                   1                   2                   3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

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

-| RPLInstanceID |D|   Flags     |  DCOSequence  |    Status     |

+| RPLInstanceID |D|   Flags     |  DCOSequence  | DCO-ACK Status|

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

|                                                               |

+                                                               +

@@ -788,8 +796,10 @@

                     copied from the DCOSequence received in the DCO messag=
e.

                 </t>

                 <t>

-                    Status: Indicates the completion. Status 0 is defined =
as

-                    unqualified acceptance in this specification. Status 1=
 is

+                    DCO-ACK Status: Indicates the completion. A value of 0=
 is

+                    defined as

+                    unqualified acceptance in this specification. A value =
of 1

+                    is

                     defined as "No routing-entry for the Target found". Th=
e

                     remaining status values are reserved as rejection code=
s.

                 </t>

@@ -910,7 +920,7 @@

                     nodes will generate their respective DAOs to update th=
eir

                     paths, and the previous route invalidation for those n=
odes

                     should work in the similar manner described for switch=
ing

-                    node. The dependent node may set the I-flag in the Tra=
nsit

+                    node. The dependent node may set the 'I' flag in the T=
ransit

                     Information Option as part of regular DAO so as to

                     request invalidation of previous route from the common

                     ancestor node.

@@ -920,7 +930,7 @@

                     of their parents in turn have decided to switch their

                     parent. Thus for route invalidation the dependent node=
s may

                     choose to always set the 'I' flag in all its DAO messa=
ge's

-                    Transit Information Option. Note that setting the I-fl=
ag is

+                    Transit Information Option. Note that setting the 'I' =
flag is

                     not counterproductive even if there is no previous

                     route to be invalidated.

                 </t>

@@ -1103,7 +1113,7 @@



         <t>

             IANA is requested to allocate bit 1 from the Transit Informati=
on

-            Option Flags registry for the I-flag (<xref target=3D"transit_=
opt_changes"/>)

+            Option Flags registry for the 'I' flag (<xref target=3D"transi=
t_opt_changes"/>)

         </t>

         <section title=3D"New Registry for the Destination Cleanup Object =
(DCO) Flags">

             <t>

@@ -1210,22 +1220,29 @@

             This document introduces the ability for a common ancestor nod=
e to

             invalidate a route on behalf of the target node. The common

             ancestor node could be directed to do so by the target node us=
ing

-            the I-flag in DCO's Transit Information Option. However, the c=
ommon

+            the 'I' flag in DCO's Transit Information Option. However, the=
 common

             ancestor node is in a position to unilaterally initiate the ro=
ute

             invalidation since it possesses all the required state informa=
tion,

             namely, the Target address and the corresponding Path Sequence=
..

             Thus a rogue common ancestor node could initiate such an

            invalidation and impact the traffic to the target node.

         </t>

+        <t> The DCO carries a RPL Status value, which is informative. New =
Status

+            values may be created over time and a node will ignore an unkn=
own

+            Status value. Which makes it so that the RPL Status field may =
be

+            used as a cover channel. But the channel only works once since=
 the

+            message destroys its own medium, that is the existing route th=
at it

+            is removing.

+        </t>

         <t>

-            This document also introduces an I-flag which is set by the ta=
rget

+            This document also introduces an 'I' flag which is set by the =
target

             node and used by the ancestor node to initiate a DCO if the

             ancestor sees an update in the route adjacency. However,

             this flag could be spoofed by a malicious 6LR in the path and =
can

             cause invalidation of an existing active path. Note that inval=
idation

             will happen only if the other conditions such as Path Sequence

             condition is also met. Having said that, such a malicious 6LR =
may

-            spoof a DAO on behalf of the (sub) child with the I-flag set a=
nd

+            spoof a DAO on behalf of the (sub) child with the 'I' flag set=
 and

             can cause route invalidation on behalf of the (sub) child node=
..

             Note that, using existing mechanisms offered by <xref

                 target=3D"RFC6550"/>, a malicious 6LR might also spoof a D=
AO with





Chairs, could we please last call or whatever so we can move on?



Many thanks!



Pascal

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

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Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Hi Pascal,&nbsp;</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
The new text contains &quot;RPL status code of 130 indicating that the addr=
ess is moved&quot;. It has no reference and no IANA consideration. Is it ok=
 to simply state this without explicit IANA consideration? Maybe I am just =
not aware of such procedural aspects of status
 code allocation, but ho<span style=3D"font-family: Calibri, Helvetica, san=
s-serif; background-color: rgb(255, 255, 255); display: inline !important">=
w would a future work avoid using this value?</span></div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Regards,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Rahul</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Roll &lt;roll-bounces=
@ietf.org&gt; on behalf of Ines Robles &lt;mariainesrobles=3D40googlemail.c=
om@dmarc.ietf.org&gt;<br>
<b>Sent:</b> Wednesday, September 4, 2019 2:02 PM<br>
<b>To:</b> Routing Over Low power and Lossy networks &lt;roll@ietf.org&gt;<=
br>
<b>Subject:</b> [Roll] Last call to draft-ietf-roll-efficient-npdao-16</fon=
t>
<div>&nbsp;</div>
</div>
<div>
<div dir=3D"ltr">
<div>Dear all,</div>
<div><br>
</div>
<div>This is a last call for the modified NPDAO document (version 16) that =
you can find here</div>
<div><br>
</div>
<div><a href=3D"https://github.com/pthubert/efficient-route-invalidation/bl=
ob/master/draft-ietf-roll-efficient-npdao.txt">https://github.com/pthubert/=
efficient-route-invalidation/blob/master/draft-ietf-roll-efficient-npdao.tx=
t</a><br>
</div>
<div><br>
</div>
<div>This call is open until 23th September. Please let us know your opinio=
n.</div>
<div><br>
</div>
<div>Thank you very much in advance,</div>
<div><br>
</div>
<div>Ines and Peter.</div>
<br>
<div class=3D"x_gmail_quote">
<div dir=3D"ltr" class=3D"x_gmail_attr">On Wed, Sep 4, 2019 at 1:10 PM Pasc=
al Thubert (pthubert) &lt;<a href=3D"mailto:pthubert@cisco.com">pthubert@ci=
sco.com</a>&gt; wrote:<br>
</div>
<blockquote class=3D"x_gmail_quote" style=3D"margin:0px 0px 0px 0.8ex; bord=
er-left:1px solid rgb(204,204,204); padding-left:1ex">
<div lang=3D"EN-US">
<div class=3D"x_gmail-m_-2457782833319735188WordSection1">
<p class=3D"x_MsoNormal"><span lang=3D"FR">Dear all<u></u><u></u></span></p=
>
<p class=3D"x_MsoNormal"><span lang=3D"FR"><u></u>&nbsp;<u></u></span></p>
<p class=3D"x_MsoNormal">We are holding NP DAO for a change that does not i=
mpact the behavior of the node but improves traceability.<u></u><u></u></p>
<p class=3D"x_MsoNormal">I would like to confirm consensus on this change r=
apidly so we can give the doc back to RFC editor.
<u></u><u></u></p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">The proposed change is as follows:<u></u><u></u></=
p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">----------------------------------<u></u><u></u></=
p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;"><u></u>&nbsp;<u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">diff --git &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\do=
c\\rpi\\draft-ietf-roll-efficient-npdao-15.xml&quot; &quot;b/C:\\Users\\pth=
ubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot=
;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">index 8a0acca..2ed0920 100644<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">--- &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\=
\draft-ietf-roll-efficient-npdao-15.xml&quot;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&#43;&#43; &quot;b/C:\\Users\\pthubert\\Dropbox\\IET=
F\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot;<u></u><u></u></sp=
an></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -35,7 &#43;35,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&lt;?rfc subcompact=3D&quot;yes&quot; ?&gt;<u></u><u></u>=
</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&lt;!-- keep one blank line between list items --&gt;<u><=
/u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&lt;!-- end of list of popular I-D processing instruction=
s --&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&lt;rfc category=3D&quot;std&quot; docName=3D&quot;draft=
-ietf-roll-efficient-npdao-15&quot; ipr=3D&quot;trust200902&quot;&gt;<u></u=
><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&lt;rfc category=3D&quot;std&quot; docName=3D&quot;d=
raft-ietf-roll-efficient-npdao-16&quot; ipr=3D&quot;trust200902&quot;&gt;<u=
></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp; &lt;!-- category values: std, bcp, info, exp=
, and historic<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ipr values: full3667, noMo=
dification3667, noDerivatives3667<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; you can add the attributes=
 updates=3D&quot;NNNN&quot; and obsoletes=3D&quot;NNNN&quot;<u></u><u></u><=
/span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -582,11 &#43;582,12 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;"><u></u>&nbsp;<u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This document specifies a change in=
 the Transit Information Option to<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; contain the &quot;Invalidate previous ro=
ute&quot; (I) flag. This I-flag signals<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; contain the &quot;Invalidate previou=
s route&quot; (I) flag. This 'I' flag signals<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the common ancestor node to generat=
e a DCO on behalf of the<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target node. The I-flag is carried in th=
e Transit Information<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target node with a RPL Status of 130=
 indicating that the address<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; has moved. The 'I' flag is carried i=
n the Transit Information<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Option which augments the reachabil=
ity information for a given<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set of RPL Target(s). Transit Informatio=
n Option with I-flag<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set of RPL Target(s). Transit Inform=
ation Option with 'I' flag<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set should be carried in the DAO me=
ssage when route<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; invalidation is sought for the corr=
esponding target(s).<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -615,8 &#43;616,8 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The common ancestor node SHOULD gen=
erate a DCO message in<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; response to this I-flag when it sees tha=
t the routing<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; adjacencies have changed for the target.=
 The I-flag is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; response to this 'I' flag when it se=
es that the routing<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; adjacencies have changed for the tar=
get. The 'I' flag is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; intended to give the target node co=
ntrol over its own route<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; invalidation, serving as a signal t=
o request DCO generation.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -638,7 &#43;639,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8=
 9 0 1<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-| RPLInstanceID |K|D|&nbsp;&nbsp; Flags&nbsp;&nbsp; |&nb=
sp;&nbsp; Reserved&nbsp;&nbsp;&nbsp; | DCOSequence&nbsp;&nbsp; |<u></u><u><=
/u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;| RPLInstanceID |K|D|&nbsp;&nbsp; Flags&nbsp;&nbsp; =
|&nbsp; RPL&nbsp; Status&nbsp; | DCOSequence&nbsp;&nbsp; |<u></u><u></u></s=
pan></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; |<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -683,8 &#43;684,15 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the sender and MUST be ignored by t=
he receiver.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Reserved: 8-bit unused field. The field =
MUST be initialized to<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; zero by the sender and MUST be ignored b=
y the receiver.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RPL Status: The RPL Status as define=
d in section 6.5.1 of &lt;xref<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target=3D&quot;RFC6550&quot;/&gt;.<u=
></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Indicative of the reason why the DCO=
 happened, the RPL Status<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MUST NOT be changed as the DCO is pr=
opagated down the route<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; being invalidated.<u></u><u></u></sp=
an></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This value is informative and does n=
ot affect the behavior of<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the receiver. In particular, unknown=
 values are ignored by the<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; receiver.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Only Rejection Codes (value above 12=
8) are expected in a DCO.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DCOSequence: 8-bit field incremente=
d at each unique DCO message<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -759,7 &#43;767,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8=
 9 0 1<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-| RPLInstanceID |D|&nbsp;&nbsp; Flags&nbsp;&nbsp;&nbsp;&=
nbsp; |&nbsp; DCOSequence&nbsp; |&nbsp;&nbsp;&nbsp; Status&nbsp;&nbsp;&nbsp=
;&nbsp; |<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;| RPLInstanceID |D|&nbsp;&nbsp; Flags&nbsp;&nbsp;&nb=
sp;&nbsp; |&nbsp; DCOSequence&nbsp; | DCO-ACK Status|<u></u><u></u></span><=
/p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; |<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -788,8 &#43;796,10 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from=
 the DCOSequence received in the DCO message.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Status: Indicate=
s the completion. Status 0 is defined as<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unqualified acce=
ptance in this specification. Status 1 is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DCO-ACK Stat=
us: Indicates the completion. A value of 0 is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; defined as<u=
></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unqualified =
acceptance in this specification. A value of 1<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; is<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;defined as =
&quot;No routing-entry for the Target found&quot;. The<u></u><u></u></span>=
</p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; remaining s=
tatus values are reserved as rejection codes.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -910,7 &#43;920,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nodes will =
generate their respective DAOs to update their<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; paths, and =
the previous route invalidation for those nodes<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; should work=
 in the similar manner described for switching<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; node. The depend=
ent node may set the I-flag in the Transit<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;node. The de=
pendent node may set the 'I' flag in the Transit<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Information=
 Option as part of regular DAO so as to<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; request inv=
alidation of previous route from the common<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ancestor no=
de.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -920,7 &#43;930,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; of their pa=
rents in turn have decided to switch their<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; parent. Thu=
s for route invalidation the dependent nodes may<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; choose to a=
lways set the 'I' flag in all its DAO message's<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transit Informat=
ion Option. Note that setting the I-flag is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Transit Info=
rmation Option. Note that setting the 'I' flag is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; not counter=
productive even if there is no previous<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; route to be=
 invalidated.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -1103,7 &#43;1113,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;"><u></u>&nbsp;<u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt=
;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; IANA is requested to allocate bit 1 from the Transit Inform=
ation<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">- &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;Option Flags registry for the I-flag (&lt;xref target=3D&quot;tr=
ansit_opt_changes&quot;/&gt;)<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Option Flags registry for the 'I' flag (&lt;xref target=3D&q=
uot;transit_opt_changes&quot;/&gt;)<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&g=
t;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;sect=
ion title=3D&quot;New Registry for the Destination Cleanup Object (DCO) Fla=
gs&quot;&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -1210,22 &#43;1220,29 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; This document introduces the ability for a common ancestor =
node to<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; invalidate a route on behalf of the target node. The common=
<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ancestor node could be directed to do so by the target node=
 using<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; the I-flag in DCO's Transit Information Option. However, the com=
mon<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; the 'I' flag in DCO's Transit Information Option. However, t=
he common<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ancestor node is in a position to unilaterally initiate the=
 route<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; invalidation since it possesses all the required state info=
rmation,<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; namely, the Target address and the corresponding Path Seque=
nce..<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Thus a rogue common ancestor node could initiate such an<u>=
</u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;invalidation and impact the traffic to the target node.<u></=
u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&g=
t;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt;=
 The DCO carries a RPL Status value, which is informative. New Status<u></u=
><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; values may be created over time and a node will ignore an un=
known<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Status value. Which makes it so that the RPL Status field ma=
y be<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; used as a cover channel. But the channel only works once sin=
ce the<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; message destroys its own medium, that is the existing route =
that it<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; is removing.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt=
;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt=
;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; This document also introduces an I-flag which is set by the targ=
et<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; This document also introduces an 'I' flag which is set by th=
e target<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; node and used by the ancestor node to initiate a DCO if the=
<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ancestor sees an update in the route adjacency. However,<u>=
</u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; this flag could be spoofed by a malicious 6LR in the path a=
nd can<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; cause invalidation of an existing active path. Note that in=
validation<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; will happen only if the other conditions such as Path Seque=
nce<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; condition is also met. Having said that, such a malicious 6=
LR may<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; spoof a DAO on behalf of the (sub) child with the I-flag set and=
<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; spoof a DAO on behalf of the (sub) child with the 'I' flag s=
et and<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; can cause route invalidation on behalf of the (sub) child n=
ode..<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Note that, using existing mechanisms offered by &lt;xref<u>=
</u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target=3D&quot;RFC6550&quot;/&gt;, =
a malicious 6LR might also spoof a DAO with<u></u><u></u></span></p>
<div style=3D"border-top:none; border-right:none; border-left:none; border-=
bottom:1pt solid windowtext; padding:0cm 0cm 1pt">
<p class=3D"x_MsoNormal" style=3D"border:none; padding:0cm"><u></u>&nbsp;<u=
></u></p>
</div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">Chairs, could we please last call or whatever so w=
e can move on?<u></u><u></u></p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">Many thanks!<u></u><u></u></p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">Pascal<u></u><u></u></p>
</div>
</div>
_______________________________________________<br>
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arget=3D"_blank">https://www.ietf.org/mailman/listinfo/roll</a><br>
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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--_000_2AAEF50F4E2345C395F10873CA692B48ciscocom_--


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From: Rahul Jadhav <nyrahul@outlook.com>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] giving back MPDAO to RFC editor
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/dj6r2AY9ARqJOWk5zc1Thiq50kI>
Subject: Re: [Roll] giving back MPDAO to RFC editor
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Thank you Pascal for the changes and pull request.
Have merged the changes.
I made two minor changes, please check if there are ok:
https://github.com/roll-wg/efficient-route-invalidation/commit/8af38e8f44b9=
63987ee6754d644d6ef70409462f

If yes, then please use the latest xml from
https://github.com/roll-wg/efficient-route-invalidation/blob/master/draft-i=
etf-roll-efficient-npdao.xml

Thanks,
Rahul
________________________________
From: Roll <roll-bounces@ietf.org> on behalf of Ines Robles <mariainesroble=
s=3D40googlemail.com@dmarc.ietf.org>
Sent: Wednesday, September 4, 2019 10:33 AM
To: Pascal Thubert (pthubert) <pthubert@cisco.com>
Cc: roll <roll@ietf.org>
Subject: Re: [Roll] giving back MPDAO to RFC editor

Hi Pascal,

Thank you very much for your hard work.

Could you please convert the draft-ietf-roll-efficient-npdao-16.xml to txt =
[https://xml2rfc.tools.ietf.org/] and put them here https://github.com/roll=
-wg/efficient-route-invalidation, so people can read the complete document =
with the proposed changes, thus we can have a last call.

Many thanks again,

Ines and Peter.



On Wed, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthubert) <pthubert@cisco.co=
m<mailto:pthubert@cisco.com>> wrote:

Dear all



We are holding NP DAO for a change that does not impact the behavior of the=
 node but improves traceability.

I would like to confirm consensus on this change rapidly so we can give the=
 doc back to RFC editor.



The proposed change is as follows:



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



diff --git "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll=
-efficient-npdao-15.xml" "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\d=
raft-ietf-roll-efficient-npdao-16.xml"

index 8a0acca..2ed0920 100644

--- "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effici=
ent-npdao-15.xml"

+++ "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effici=
ent-npdao-16.xml"

@@ -35,7 +35,7 @@

<?rfc subcompact=3D"yes" ?>

<!-- keep one blank line between list items -->

<!-- end of list of popular I-D processing instructions -->

-<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-15" ipr=
=3D"trust200902">

+<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-16" ipr=
=3D"trust200902">

   <!-- category values: std, bcp, info, exp, and historic

      ipr values: full3667, noModification3667, noDerivatives3667

      you can add the attributes updates=3D"NNNN" and obsoletes=3D"NNNN"

@@ -582,11 +582,12 @@



             <t>

                 This document specifies a change in the Transit Informatio=
n Option to

-                contain the "Invalidate previous route" (I) flag. This I-f=
lag signals

+                contain the "Invalidate previous route" (I) flag. This 'I'=
 flag signals

                 the common ancestor node to generate a DCO on behalf of th=
e

-                target node. The I-flag is carried in the Transit Informat=
ion

+                target node with a RPL Status of 130 indicating that the a=
ddress

+                has moved. The 'I' flag is carried in the Transit Informat=
ion

                 Option which augments the reachability information for a g=
iven

-                set of RPL Target(s). Transit Information Option with I-fl=
ag

+                set of RPL Target(s). Transit Information Option with 'I' =
flag

                 set should be carried in the DAO message when route

                 invalidation is sought for the corresponding target(s).

             </t>

@@ -615,8 +616,8 @@

             </t>

             <t>

                 The common ancestor node SHOULD generate a DCO message in

-                response to this I-flag when it sees that the routing

-                adjacencies have changed for the target. The I-flag is

+                response to this 'I' flag when it sees that the routing

+                adjacencies have changed for the target. The 'I' flag is

                 intended to give the target node control over its own rout=
e

                 invalidation, serving as a signal to request DCO generatio=
n.

             </t>

@@ -638,7 +639,7 @@

0                   1                   2                   3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

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

-| RPLInstanceID |K|D|   Flags   |   Reserved    | DCOSequence   |

+| RPLInstanceID |K|D|   Flags   |  RPL  Status  | DCOSequence   |

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

|                                                               |

+                                                               +

@@ -683,8 +684,15 @@

                 the sender and MUST be ignored by the receiver.

             </t>

             <t>

-                Reserved: 8-bit unused field. The field MUST be initialize=
d to

-                zero by the sender and MUST be ignored by the receiver.

+                RPL Status: The RPL Status as defined in section 6.5.1 of =
<xref

+                target=3D"RFC6550"/>.

+                Indicative of the reason why the DCO happened, the RPL Sta=
tus

+                MUST NOT be changed as the DCO is propagated down the rout=
e

+                being invalidated.

+                This value is informative and does not affect the behavior=
 of

+                the receiver. In particular, unknown values are ignored by=
 the

+                receiver.

+                Only Rejection Codes (value above 128) are expected in a D=
CO.

             </t>

             <t>

                 DCOSequence: 8-bit field incremented at each unique DCO me=
ssage

@@ -759,7 +767,7 @@

0                   1                   2                   3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

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

-| RPLInstanceID |D|   Flags     |  DCOSequence  |    Status     |

+| RPLInstanceID |D|   Flags     |  DCOSequence  | DCO-ACK Status|

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

|                                                               |

+                                                               +

@@ -788,8 +796,10 @@

                     copied from the DCOSequence received in the DCO messag=
e.

                 </t>

                 <t>

-                    Status: Indicates the completion. Status 0 is defined =
as

-                    unqualified acceptance in this specification. Status 1=
 is

+                    DCO-ACK Status: Indicates the completion. A value of 0=
 is

+                    defined as

+                    unqualified acceptance in this specification. A value =
of 1

+                    is

                     defined as "No routing-entry for the Target found". Th=
e

                     remaining status values are reserved as rejection code=
s.

                 </t>

@@ -910,7 +920,7 @@

                     nodes will generate their respective DAOs to update th=
eir

                     paths, and the previous route invalidation for those n=
odes

                     should work in the similar manner described for switch=
ing

-                    node. The dependent node may set the I-flag in the Tra=
nsit

+                    node. The dependent node may set the 'I' flag in the T=
ransit

                     Information Option as part of regular DAO so as to

                     request invalidation of previous route from the common

                     ancestor node.

@@ -920,7 +930,7 @@

                     of their parents in turn have decided to switch their

                     parent. Thus for route invalidation the dependent node=
s may

                     choose to always set the 'I' flag in all its DAO messa=
ge's

-                    Transit Information Option. Note that setting the I-fl=
ag is

+                    Transit Information Option. Note that setting the 'I' =
flag is

                     not counterproductive even if there is no previous

                     route to be invalidated.

                 </t>

@@ -1103,7 +1113,7 @@



         <t>

             IANA is requested to allocate bit 1 from the Transit Informati=
on

-            Option Flags registry for the I-flag (<xref target=3D"transit_=
opt_changes"/>)

+            Option Flags registry for the 'I' flag (<xref target=3D"transi=
t_opt_changes"/>)

         </t>

         <section title=3D"New Registry for the Destination Cleanup Object =
(DCO) Flags">

             <t>

@@ -1210,22 +1220,29 @@

             This document introduces the ability for a common ancestor nod=
e to

             invalidate a route on behalf of the target node. The common

             ancestor node could be directed to do so by the target node us=
ing

-            the I-flag in DCO's Transit Information Option. However, the c=
ommon

+            the 'I' flag in DCO's Transit Information Option. However, the=
 common

             ancestor node is in a position to unilaterally initiate the ro=
ute

             invalidation since it possesses all the required state informa=
tion,

             namely, the Target address and the corresponding Path Sequence=
..

             Thus a rogue common ancestor node could initiate such an

            invalidation and impact the traffic to the target node.

         </t>

+        <t> The DCO carries a RPL Status value, which is informative. New =
Status

+            values may be created over time and a node will ignore an unkn=
own

+            Status value. Which makes it so that the RPL Status field may =
be

+            used as a cover channel. But the channel only works once since=
 the

+            message destroys its own medium, that is the existing route th=
at it

+            is removing.

+        </t>

         <t>

-            This document also introduces an I-flag which is set by the ta=
rget

+            This document also introduces an 'I' flag which is set by the =
target

             node and used by the ancestor node to initiate a DCO if the

             ancestor sees an update in the route adjacency. However,

             this flag could be spoofed by a malicious 6LR in the path and =
can

             cause invalidation of an existing active path. Note that inval=
idation

             will happen only if the other conditions such as Path Sequence

             condition is also met. Having said that, such a malicious 6LR =
may

-            spoof a DAO on behalf of the (sub) child with the I-flag set a=
nd

+            spoof a DAO on behalf of the (sub) child with the 'I' flag set=
 and

             can cause route invalidation on behalf of the (sub) child node=
..

             Note that, using existing mechanisms offered by <xref

                 target=3D"RFC6550"/>, a malicious 6LR might also spoof a D=
AO with





Chairs, could we please last call or whatever so we can move on?



Many thanks!



Pascal

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

--_000_BM1PR01MB26126BE7BC1F809C34E0B5DBA9BB0BM1PR01MB2612INDP_
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dus-ascii"=
>
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Thank you Pascal for the changes and pull request.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Have merged the changes.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
I made two minor changes, please check if there are ok:&nbsp;</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<a href=3D"https://github.com/roll-wg/efficient-route-invalidation/commit/8=
af38e8f44b963987ee6754d644d6ef70409462f">https://github.com/roll-wg/efficie=
nt-route-invalidation/commit/8af38e8f44b963987ee6754d644d6ef70409462f</a><b=
r>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
If yes, then please use the latest xml from&nbsp;</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<a href=3D"https://github.com/roll-wg/efficient-route-invalidation/blob/mas=
ter/draft-ietf-roll-efficient-npdao.xml">https://github.com/roll-wg/efficie=
nt-route-invalidation/blob/master/draft-ietf-roll-efficient-npdao.xml</a><b=
r>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Thanks,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Rahul</div>
<div id=3D"appendonsend"></div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Roll &lt;roll-bounces=
@ietf.org&gt; on behalf of Ines Robles &lt;mariainesrobles=3D40googlemail.c=
om@dmarc.ietf.org&gt;<br>
<b>Sent:</b> Wednesday, September 4, 2019 10:33 AM<br>
<b>To:</b> Pascal Thubert (pthubert) &lt;pthubert@cisco.com&gt;<br>
<b>Cc:</b> roll &lt;roll@ietf.org&gt;<br>
<b>Subject:</b> Re: [Roll] giving back MPDAO to RFC editor</font>
<div>&nbsp;</div>
</div>
<div>
<div dir=3D"ltr">Hi Pascal,
<div><br>
</div>
<div>Thank you very much for your hard work.&nbsp;</div>
<div><br>
</div>
<div>Could you please convert the&nbsp;<span style=3D"font-family:&quot;Cou=
rier New&quot;; font-size:13.3333px">draft-ietf-roll-efficient-</span><span=
 style=3D"font-family:&quot;Courier New&quot;; font-size:13.3333px">npdao-1=
6.xml to txt [</span><a href=3D"https://xml2rfc.tools.ietf.org/">https://xm=
l2rfc.tools.ietf.org/</a><span style=3D"font-family:&quot;Courier New&quot;=
; font-size:13.3333px">]
 and put them here&nbsp;</span><a href=3D"https://github.com/roll-wg/effici=
ent-route-invalidation">https://github.com/roll-wg/efficient-route-invalida=
tion</a><span style=3D"font-family:&quot;Courier New&quot;; font-size:13.33=
33px">, so people can read the complete document with
 the proposed changes, thus we can have a last call.</span></div>
<div><span style=3D"font-family:&quot;Courier New&quot;; font-size:13.3333p=
x"><br>
</span></div>
<div><span style=3D"font-family:&quot;Courier New&quot;; font-size:13.3333p=
x">Many thanks again,</span></div>
<div><span style=3D"font-family:&quot;Courier New&quot;; font-size:13.3333p=
x"><br>
</span></div>
<div><span style=3D"font-family:&quot;Courier New&quot;; font-size:13.3333p=
x">Ines and Peter.</span></div>
<div><span style=3D"font-family:&quot;Courier New&quot;; font-size:13.3333p=
x"><br>
</span></div>
<div><span style=3D"font-family:&quot;Courier New&quot;; font-size:13.3333p=
x">&nbsp;</span></div>
</div>
<br>
<div class=3D"x_gmail_quote">
<div dir=3D"ltr" class=3D"x_gmail_attr">On Wed, Sep 4, 2019 at 1:10 PM Pasc=
al Thubert (pthubert) &lt;<a href=3D"mailto:pthubert@cisco.com">pthubert@ci=
sco.com</a>&gt; wrote:<br>
</div>
<blockquote class=3D"x_gmail_quote" style=3D"">
<div lang=3D"EN-US">
<div class=3D"x_gmail-m_-2457782833319735188WordSection1">
<p class=3D"x_MsoNormal"><span lang=3D"FR">Dear all<u></u><u></u></span></p=
>
<p class=3D"x_MsoNormal"><span lang=3D"FR"><u></u>&nbsp;<u></u></span></p>
<p class=3D"x_MsoNormal">We are holding NP DAO for a change that does not i=
mpact the behavior of the node but improves traceability.<u></u><u></u></p>
<p class=3D"x_MsoNormal">I would like to confirm consensus on this change r=
apidly so we can give the doc back to RFC editor.
<u></u><u></u></p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">The proposed change is as follows:<u></u><u></u></=
p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">----------------------------------<u></u><u></u></=
p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;"><u></u>&nbsp;<u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">diff --git &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\do=
c\\rpi\\draft-ietf-roll-efficient-npdao-15.xml&quot; &quot;b/C:\\Users\\pth=
ubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot=
;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">index 8a0acca..2ed0920 100644<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">--- &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\=
\draft-ietf-roll-efficient-npdao-15.xml&quot;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&#43;&#43; &quot;b/C:\\Users\\pthubert\\Dropbox\\IET=
F\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot;<u></u><u></u></sp=
an></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -35,7 &#43;35,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&lt;?rfc subcompact=3D&quot;yes&quot; ?&gt;<u></u><u></u>=
</span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&lt;!-- keep one blank line between list items --&gt;<u><=
/u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&lt;!-- end of list of popular I-D processing instruction=
s --&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&lt;rfc category=3D&quot;std&quot; docName=3D&quot;draft=
-ietf-roll-efficient-npdao-15&quot; ipr=3D&quot;trust200902&quot;&gt;<u></u=
><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&lt;rfc category=3D&quot;std&quot; docName=3D&quot;d=
raft-ietf-roll-efficient-npdao-16&quot; ipr=3D&quot;trust200902&quot;&gt;<u=
></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp; &lt;!-- category values: std, bcp, info, exp=
, and historic<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ipr values: full3667, noMo=
dification3667, noDerivatives3667<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; you can add the attributes=
 updates=3D&quot;NNNN&quot; and obsoletes=3D&quot;NNNN&quot;<u></u><u></u><=
/span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -582,11 &#43;582,12 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;"><u></u>&nbsp;<u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This document specifies a change in=
 the Transit Information Option to<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; contain the &quot;Invalidate previous ro=
ute&quot; (I) flag. This I-flag signals<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; contain the &quot;Invalidate previou=
s route&quot; (I) flag. This 'I' flag signals<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the common ancestor node to generat=
e a DCO on behalf of the<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target node. The I-flag is carried in th=
e Transit Information<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target node with a RPL Status of 130=
 indicating that the address<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; has moved. The 'I' flag is carried i=
n the Transit Information<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Option which augments the reachabil=
ity information for a given<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set of RPL Target(s). Transit Informatio=
n Option with I-flag<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set of RPL Target(s). Transit Inform=
ation Option with 'I' flag<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set should be carried in the DAO me=
ssage when route<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; invalidation is sought for the corr=
esponding target(s).<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -615,8 &#43;616,8 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The common ancestor node SHOULD gen=
erate a DCO message in<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; response to this I-flag when it sees tha=
t the routing<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; adjacencies have changed for the target.=
 The I-flag is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; response to this 'I' flag when it se=
es that the routing<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; adjacencies have changed for the tar=
get. The 'I' flag is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; intended to give the target node co=
ntrol over its own route<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; invalidation, serving as a signal t=
o request DCO generation.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -638,7 &#43;639,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8=
 9 0 1<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-| RPLInstanceID |K|D|&nbsp;&nbsp; Flags&nbsp;&nbsp; |&nb=
sp;&nbsp; Reserved&nbsp;&nbsp;&nbsp; | DCOSequence&nbsp;&nbsp; |<u></u><u><=
/u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;| RPLInstanceID |K|D|&nbsp;&nbsp; Flags&nbsp;&nbsp; =
|&nbsp; RPL&nbsp; Status&nbsp; | DCOSequence&nbsp;&nbsp; |<u></u><u></u></s=
pan></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; |<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -683,8 &#43;684,15 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the sender and MUST be ignored by t=
he receiver.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Reserved: 8-bit unused field. The field =
MUST be initialized to<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; zero by the sender and MUST be ignored b=
y the receiver.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RPL Status: The RPL Status as define=
d in section 6.5.1 of &lt;xref<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target=3D&quot;RFC6550&quot;/&gt;.<u=
></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Indicative of the reason why the DCO=
 happened, the RPL Status<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MUST NOT be changed as the DCO is pr=
opagated down the route<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; being invalidated.<u></u><u></u></sp=
an></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This value is informative and does n=
ot affect the behavior of<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the receiver. In particular, unknown=
 values are ignored by the<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; receiver.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Only Rejection Codes (value above 12=
8) are expected in a DCO.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DCOSequence: 8-bit field incremente=
d at each unique DCO message<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -759,7 &#43;767,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8=
 9 0 1<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-| RPLInstanceID |D|&nbsp;&nbsp; Flags&nbsp;&nbsp;&nbsp;&=
nbsp; |&nbsp; DCOSequence&nbsp; |&nbsp;&nbsp;&nbsp; Status&nbsp;&nbsp;&nbsp=
;&nbsp; |<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;| RPLInstanceID |D|&nbsp;&nbsp; Flags&nbsp;&nbsp;&nb=
sp;&nbsp; |&nbsp; DCOSequence&nbsp; | DCO-ACK Status|<u></u><u></u></span><=
/p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; |<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -788,8 &#43;796,10 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from=
 the DCOSequence received in the DCO message.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Status: Indicate=
s the completion. Status 0 is defined as<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unqualified acce=
ptance in this specification. Status 1 is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DCO-ACK Stat=
us: Indicates the completion. A value of 0 is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; defined as<u=
></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unqualified =
acceptance in this specification. A value of 1<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; is<u></u><u>=
</u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;defined as =
&quot;No routing-entry for the Target found&quot;. The<u></u><u></u></span>=
</p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; remaining s=
tatus values are reserved as rejection codes.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -910,7 &#43;920,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nodes will =
generate their respective DAOs to update their<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; paths, and =
the previous route invalidation for those nodes<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; should work=
 in the similar manner described for switching<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; node. The depend=
ent node may set the I-flag in the Transit<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;node. The de=
pendent node may set the 'I' flag in the Transit<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Information=
 Option as part of regular DAO so as to<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; request inv=
alidation of previous route from the common<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ancestor no=
de.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -920,7 &#43;930,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; of their pa=
rents in turn have decided to switch their<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; parent. Thu=
s for route invalidation the dependent nodes may<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; choose to a=
lways set the 'I' flag in all its DAO message's<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transit Informat=
ion Option. Note that setting the I-flag is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Transit Info=
rmation Option. Note that setting the 'I' flag is<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; not counter=
productive even if there is no previous<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; route to be=
 invalidated.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -1103,7 &#43;1113,7 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;"><u></u>&nbsp;<u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt=
;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; IANA is requested to allocate bit 1 from the Transit Inform=
ation<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">- &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;Option Flags registry for the I-flag (&lt;xref target=3D&quot;tr=
ansit_opt_changes&quot;/&gt;)<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Option Flags registry for the 'I' flag (&lt;xref target=3D&q=
uot;transit_opt_changes&quot;/&gt;)<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&g=
t;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;sect=
ion title=3D&quot;New Registry for the Destination Cleanup Object (DCO) Fla=
gs&quot;&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">@@ -1210,22 &#43;1220,29 @@<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; This document introduces the ability for a common ancestor =
node to<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; invalidate a route on behalf of the target node. The common=
<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ancestor node could be directed to do so by the target node=
 using<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; the I-flag in DCO's Transit Information Option. However, the com=
mon<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; the 'I' flag in DCO's Transit Information Option. However, t=
he common<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ancestor node is in a position to unilaterally initiate the=
 route<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; invalidation since it possesses all the required state info=
rmation,<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; namely, the Target address and the corresponding Path Seque=
nce..<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Thus a rogue common ancestor node could initiate such an<u>=
</u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;invalidation and impact the traffic to the target node.<u></=
u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&g=
t;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt;=
 The DCO carries a RPL Status value, which is informative. New Status<u></u=
><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; values may be created over time and a node will ignore an un=
known<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Status value. Which makes it so that the RPL Status field ma=
y be<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; used as a cover channel. But the channel only works once sin=
ce the<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; message destroys its own medium, that is the existing route =
that it<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; is removing.<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt=
;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt=
;<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; This document also introduces an I-flag which is set by the targ=
et<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; This document also introduces an 'I' flag which is set by th=
e target<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; node and used by the ancestor node to initiate a DCO if the=
<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ancestor sees an update in the route adjacency. However,<u>=
</u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; this flag could be spoofed by a malicious 6LR in the path a=
nd can<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; cause invalidation of an existing active path. Note that in=
validation<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; will happen only if the other conditions such as Path Seque=
nce<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; condition is also met. Having said that, such a malicious 6=
LR may<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; spoof a DAO on behalf of the (sub) child with the I-flag set and=
<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; spoof a DAO on behalf of the (sub) child with the 'I' flag s=
et and<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; can cause route invalidation on behalf of the (sub) child n=
ode..<u></u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Note that, using existing mechanisms offered by &lt;xref<u>=
</u><u></u></span></p>
<p class=3D"x_MsoNormal"><span style=3D"font-size:10pt; font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target=3D&quot;RFC6550&quot;/&gt;, =
a malicious 6LR might also spoof a DAO with<u></u><u></u></span></p>
<div style=3D"border-top:none; border-right:none; border-left:none; border-=
bottom:1pt solid windowtext; padding:0cm 0cm 1pt">
<p class=3D"x_MsoNormal" style=3D"border:none; padding:0cm"><u></u>&nbsp;<u=
></u></p>
</div>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">Chairs, could we please last call or whatever so w=
e can move on?<u></u><u></u></p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">Many thanks!<u></u><u></u></p>
<p class=3D"x_MsoNormal"><u></u>&nbsp;<u></u></p>
<p class=3D"x_MsoNormal">Pascal<u></u><u></u></p>
</div>
</div>
_______________________________________________<br>
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<a href=3D"mailto:Roll@ietf.org" target=3D"_blank">Roll@ietf.org</a><br>
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arget=3D"_blank">https://www.ietf.org/mailman/listinfo/roll</a><br>
</blockquote>
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Rahul Jadhav <nyrahul@outlook.com>, "Routing Over Low power and Lossy networks" <roll@ietf.org>
Thread-Topic: [Roll] giving back MPDAO to RFC editor
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Subject: Re: [Roll] giving back MPDAO to RFC editor
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--_000_MN2PR11MB3565D2139143EFF0F43055E3D8BB0MN2PR11MB3565namp_
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Hello Rahul

RPL says

     1-127:  Not an outright rejection; the node sending the DAO-ACK
               is willing to act as a parent, but the receiving node is
               suggested to find and use an alternate parent instead.
     127-255:  Rejection; the node sending the DAO-ACK is unwilling to
               act as a parent.


Note that the 127 as a rejection is a typo. The intent was that 127 is not =
a rejection. We could write an erratum for this I guess so rejection starts=
 at 128.

All the best,

Pascal

From: Rahul Jadhav <nyrahul@outlook.com<mailto:nyrahul@outlook.com>>
Sent: jeudi 5 septembre 2019 05:44
To: Pascal Thubert (pthubert) <pthubert@cisco.com<mailto:pthubert@cisco.com=
>>; Routing Over Low power and Lossy networks <roll@ietf.org<mailto:roll@ie=
tf.org>>
Subject: Re: [Roll] giving back MPDAO to RFC editor

Thank you Pascal for the changes and pull request.
Have merged the changes.
I made two minor changes, please check if there are ok:
https://github.com/roll-wg/efficient-route-invalidation/commit/8af38e8f44b9=
63987ee6754d644d6ef70409462f

If yes, then please use the latest xml from
https://github.com/roll-wg/efficient-route-invalidation/blob/master/draft-i=
etf-roll-efficient-npdao.xml

Thanks,
Rahul
________________________________
From: Roll <roll-bounces@ietf.org<mailto:roll-bounces@ietf.org>> on behalf =
of Ines Robles <mariainesrobles=3D40googlemail.com@dmarc.ietf.org<mailto:ma=
riainesrobles=3D40googlemail.com@dmarc.ietf.org>>
Sent: Wednesday, September 4, 2019 10:33 AM
To: Pascal Thubert (pthubert) <pthubert@cisco.com<mailto:pthubert@cisco.com=
>>
Cc: roll <roll@ietf.org<mailto:roll@ietf.org>>
Subject: Re: [Roll] giving back MPDAO to RFC editor

Hi Pascal,

Thank you very much for your hard work.

Could you please convert the draft-ietf-roll-efficient-npdao-16.xml to txt =
[https://xml2rfc.tools.ietf.org/] and put them here https://github.com/roll=
-wg/efficient-route-invalidation, so people can read the complete document =
with the proposed changes, thus we can have a last call.

Many thanks again,

Ines and Peter.



On Wed, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthubert) <pthubert@cisco.co=
m<mailto:pthubert@cisco.com>> wrote:

Dear all



We are holding NP DAO for a change that does not impact the behavior of the=
 node but improves traceability.

I would like to confirm consensus on this change rapidly so we can give the=
 doc back to RFC editor.



The proposed change is as follows:



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



diff --git "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll=
-efficient-npdao-15.xml" "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\d=
raft-ietf-roll-efficient-npdao-16.xml"

index 8a0acca..2ed0920 100644

--- "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effici=
ent-npdao-15.xml"

+++ "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effici=
ent-npdao-16.xml"

@@ -35,7 +35,7 @@

<?rfc subcompact=3D"yes" ?>

<!-- keep one blank line between list items -->

<!-- end of list of popular I-D processing instructions -->

-<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-15" ipr=
=3D"trust200902">

+<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-16" ipr=
=3D"trust200902">

   <!-- category values: std, bcp, info, exp, and historic

      ipr values: full3667, noModification3667, noDerivatives3667

      you can add the attributes updates=3D"NNNN" and obsoletes=3D"NNNN"

@@ -582,11 +582,12 @@



             <t>

                 This document specifies a change in the Transit Informatio=
n Option to

-                contain the "Invalidate previous route" (I) flag. This I-f=
lag signals

+                contain the "Invalidate previous route" (I) flag. This 'I'=
 flag signals

                 the common ancestor node to generate a DCO on behalf of th=
e

-                target node. The I-flag is carried in the Transit Informat=
ion

+                target node with a RPL Status of 130 indicating that the a=
ddress

+                has moved. The 'I' flag is carried in the Transit Informat=
ion

                 Option which augments the reachability information for a g=
iven

-                set of RPL Target(s). Transit Information Option with I-fl=
ag

+                set of RPL Target(s). Transit Information Option with 'I' =
flag

                 set should be carried in the DAO message when route

                 invalidation is sought for the corresponding target(s).

             </t>

@@ -615,8 +616,8 @@

             </t>

             <t>

                 The common ancestor node SHOULD generate a DCO message in

-                response to this I-flag when it sees that the routing

-                adjacencies have changed for the target. The I-flag is

+                response to this 'I' flag when it sees that the routing

+                adjacencies have changed for the target. The 'I' flag is

                 intended to give the target node control over its own rout=
e

                 invalidation, serving as a signal to request DCO generatio=
n.

             </t>

@@ -638,7 +639,7 @@

0                   1                   2                   3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

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

-| RPLInstanceID |K|D|   Flags   |   Reserved    | DCOSequence   |

+| RPLInstanceID |K|D|   Flags   |  RPL  Status  | DCOSequence   |

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

|                                                               |

+                                                               +

@@ -683,8 +684,15 @@

                 the sender and MUST be ignored by the receiver.

             </t>

             <t>

-                Reserved: 8-bit unused field. The field MUST be initialize=
d to

-                zero by the sender and MUST be ignored by the receiver.

+                RPL Status: The RPL Status as defined in section 6.5.1 of =
<xref

+                target=3D"RFC6550"/>.

+                Indicative of the reason why the DCO happened, the RPL Sta=
tus

+                MUST NOT be changed as the DCO is propagated down the rout=
e

+                being invalidated.

+                This value is informative and does not affect the behavior=
 of

+                the receiver. In particular, unknown values are ignored by=
 the

+                receiver.

+                Only Rejection Codes (value above 128) are expected in a D=
CO.

             </t>

             <t>

                 DCOSequence: 8-bit field incremented at each unique DCO me=
ssage

@@ -759,7 +767,7 @@

0                   1                   2                   3

0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

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

-| RPLInstanceID |D|   Flags     |  DCOSequence  |    Status     |

+| RPLInstanceID |D|   Flags     |  DCOSequence  | DCO-ACK Status|

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

|                                                               |

+                                                               +

@@ -788,8 +796,10 @@

                     copied from the DCOSequence received in the DCO messag=
e.

                 </t>

                 <t>

-                    Status: Indicates the completion. Status 0 is defined =
as

-                    unqualified acceptance in this specification. Status 1=
 is

+                    DCO-ACK Status: Indicates the completion. A value of 0=
 is

+                    defined as

+                    unqualified acceptance in this specification. A value =
of 1

+                    is

                     defined as "No routing-entry for the Target found". Th=
e

                     remaining status values are reserved as rejection code=
s.

                 </t>

@@ -910,7 +920,7 @@

                     nodes will generate their respective DAOs to update th=
eir

                     paths, and the previous route invalidation for those n=
odes

                     should work in the similar manner described for switch=
ing

-                    node. The dependent node may set the I-flag in the Tra=
nsit

+                    node. The dependent node may set the 'I' flag in the T=
ransit

                     Information Option as part of regular DAO so as to

                     request invalidation of previous route from the common

                     ancestor node.

@@ -920,7 +930,7 @@

                     of their parents in turn have decided to switch their

                     parent. Thus for route invalidation the dependent node=
s may

                     choose to always set the 'I' flag in all its DAO messa=
ge's

-                    Transit Information Option. Note that setting the I-fl=
ag is

+                    Transit Information Option. Note that setting the 'I' =
flag is

                     not counterproductive even if there is no previous

                     route to be invalidated.

                 </t>

@@ -1103,7 +1113,7 @@



         <t>

             IANA is requested to allocate bit 1 from the Transit Informati=
on

-            Option Flags registry for the I-flag (<xref target=3D"transit_=
opt_changes"/>)

+            Option Flags registry for the 'I' flag (<xref target=3D"transi=
t_opt_changes"/>)

         </t>

         <section title=3D"New Registry for the Destination Cleanup Object =
(DCO) Flags">

             <t>

@@ -1210,22 +1220,29 @@

             This document introduces the ability for a common ancestor nod=
e to

             invalidate a route on behalf of the target node. The common

             ancestor node could be directed to do so by the target node us=
ing

-            the I-flag in DCO's Transit Information Option. However, the c=
ommon

+            the 'I' flag in DCO's Transit Information Option. However, the=
 common

             ancestor node is in a position to unilaterally initiate the ro=
ute

             invalidation since it possesses all the required state informa=
tion,

             namely, the Target address and the corresponding Path Sequence=
..

             Thus a rogue common ancestor node could initiate such an

            invalidation and impact the traffic to the target node.

         </t>

+        <t> The DCO carries a RPL Status value, which is informative. New =
Status

+            values may be created over time and a node will ignore an unkn=
own

+            Status value. Which makes it so that the RPL Status field may =
be

+            used as a cover channel. But the channel only works once since=
 the

+            message destroys its own medium, that is the existing route th=
at it

+            is removing.

+        </t>

         <t>

-            This document also introduces an I-flag which is set by the ta=
rget

+            This document also introduces an 'I' flag which is set by the =
target

             node and used by the ancestor node to initiate a DCO if the

             ancestor sees an update in the route adjacency. However,

             this flag could be spoofed by a malicious 6LR in the path and =
can

             cause invalidation of an existing active path. Note that inval=
idation

             will happen only if the other conditions such as Path Sequence

             condition is also met. Having said that, such a malicious 6LR =
may

-            spoof a DAO on behalf of the (sub) child with the I-flag set a=
nd

+            spoof a DAO on behalf of the (sub) child with the 'I' flag set=
 and

             can cause route invalidation on behalf of the (sub) child node=
..

             Note that, using existing mechanisms offered by <xref

                 target=3D"RFC6550"/>, a malicious 6LR might also spoof a D=
AO with





Chairs, could we please last call or whatever so we can move on?



Many thanks!



Pascal
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</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hello Rahul<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">RPL says<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp; 1-127:&nbsp; Not an outright reje=
ction; the node sending the DAO-ACK<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; is willing to act as a parent, but the receiving=
 node is<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; suggested to find and use an alternate parent in=
stead.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp; 127-255:&nbsp; Rejection; the nod=
e sending the DAO-ACK is unwilling to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp; act as a parent.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Note that the 127 as a rejection is a typo. The inte=
nt was that 127 is not a rejection. We could write an erratum for this I gu=
ess so rejection starts at 128.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">All the best,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Rahul Jadhav &lt;<a href=3D"mailto:nyra=
hul@outlook.com">nyrahul@outlook.com</a>&gt;
<br>
<b>Sent:</b> jeudi 5 septembre 2019 05:44<br>
<b>To:</b> Pascal Thubert (pthubert) &lt;<a href=3D"mailto:pthubert@cisco.c=
om">pthubert@cisco.com</a>&gt;; Routing Over Low power and Lossy networks &=
lt;<a href=3D"mailto:roll@ietf.org">roll@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [Roll] giving back MPDAO to RFC editor<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">Thank y=
ou Pascal for the changes and pull request.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">Have me=
rged the changes.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">I made =
two minor changes, please check if there are ok:&nbsp;<o:p></o:p></span></p=
>
</div>
<div>
<p class=3D"MsoNormal"><a href=3D"https://github.com/roll-wg/efficient-rout=
e-invalidation/commit/8af38e8f44b963987ee6754d644d6ef70409462f"><span style=
=3D"font-size:12.0pt">https://github.com/roll-wg/efficient-route-invalidati=
on/commit/8af38e8f44b963987ee6754d644d6ef70409462f</span></a><span style=3D=
"font-size:12.0pt;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black"><o:p>&n=
bsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">If yes,=
 then please use the latest xml from&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><a href=3D"https://github.com/roll-wg/efficient-rout=
e-invalidation/blob/master/draft-ietf-roll-efficient-npdao.xml"><span style=
=3D"font-size:12.0pt">https://github.com/roll-wg/efficient-route-invalidati=
on/blob/master/draft-ietf-roll-efficient-npdao.xml</span></a><span style=3D=
"font-size:12.0pt;color:black"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black"><o:p>&n=
bsp;</o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">Thanks,=
<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;color:black">Rahul<o=
:p></o:p></span></p>
</div>
<div class=3D"MsoNormal" align=3D"center" style=3D"text-align:center">
<hr size=3D"4" width=3D"98%" align=3D"center">
</div>
<div id=3D"divRplyFwdMsg">
<p class=3D"MsoNormal"><b><span style=3D"color:black">From:</span></b><span=
 style=3D"color:black"> Roll &lt;</span><a href=3D"mailto:roll-bounces@ietf=
.org">roll-bounces@ietf.org</a><span style=3D"color:black">&gt; on behalf o=
f Ines Robles &lt;</span><a href=3D"mailto:mariainesrobles=3D40googlemail.c=
om@dmarc.ietf.org">mariainesrobles=3D40googlemail.com@dmarc.ietf.org</a><sp=
an style=3D"color:black">&gt;<br>
<b>Sent:</b> Wednesday, September 4, 2019 10:33 AM<br>
<b>To:</b> Pascal Thubert (pthubert) &lt;</span><a href=3D"mailto:pthubert@=
cisco.com">pthubert@cisco.com</a><span style=3D"color:black">&gt;<br>
<b>Cc:</b> roll &lt;</span><a href=3D"mailto:roll@ietf.org">roll@ietf.org</=
a><span style=3D"color:black">&gt;<br>
<b>Subject:</b> Re: [Roll] giving back MPDAO to RFC editor</span> <o:p></o:=
p></p>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
</div>
<div>
<div>
<p class=3D"MsoNormal">Hi Pascal, <o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thank you very much for your hard work.&nbsp;<o:p></=
o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Could you please convert the&nbsp;<span style=3D"fon=
t-size:10.0pt;font-family:&quot;Courier New&quot;">draft-ietf-roll-efficien=
t-npdao-16.xml to txt [</span><a href=3D"https://xml2rfc.tools.ietf.org/">h=
ttps://xml2rfc.tools.ietf.org/</a><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;">]
 and put them here&nbsp;</span><a href=3D"https://github.com/roll-wg/effici=
ent-route-invalidation">https://github.com/roll-wg/efficient-route-invalida=
tion</a><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;=
">, so people can read the complete document with the
 proposed changes, thus we can have a last call.</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Many thanks again,</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Ines and Peter.</span><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">&nbsp;</span><o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Wed, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthub=
ert) &lt;<a href=3D"mailto:pthubert@cisco.com">pthubert@cisco.com</a>&gt; w=
rote:<o:p></o:p></p>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class=3D"xmsonormal">Dear all<o:p></o:p></p>
<p class=3D"xmsonormal">&nbsp;<o:p></o:p></p>
<p class=3D"xmsonormal">We are holding NP DAO for a change that does not im=
pact the behavior of the node but improves traceability.<o:p></o:p></p>
<p class=3D"xmsonormal">I would like to confirm consensus on this change ra=
pidly so we can give the doc back to RFC editor.
<o:p></o:p></p>
<p class=3D"xmsonormal">&nbsp;<o:p></o:p></p>
<p class=3D"xmsonormal">The proposed change is as follows:<o:p></o:p></p>
<p class=3D"xmsonormal">&nbsp;<o:p></o:p></p>
<p class=3D"xmsonormal">----------------------------------<o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">diff --git &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\do=
c\\rpi\\draft-ietf-roll-efficient-npdao-15.xml&quot; &quot;b/C:\\Users\\pth=
ubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot=
;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">index 8a0acca..2ed0920 100644</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">--- &quot;a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\=
\draft-ietf-roll-efficient-npdao-15.xml&quot;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&#43;&#43; &quot;b/C:\\Users\\pthubert\\Dropbox\\IET=
F\\doc\\rpi\\draft-ietf-roll-efficient-npdao-16.xml&quot;</span><o:p></o:p>=
</p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -35,7 &#43;35,7 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&lt;?rfc subcompact=3D&quot;yes&quot; ?&gt;</span><o:p></=
o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&lt;!-- keep one blank line between list items --&gt;</sp=
an><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&lt;!-- end of list of popular I-D processing instruction=
s --&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&lt;rfc category=3D&quot;std&quot; docName=3D&quot;draft=
-ietf-roll-efficient-npdao-15&quot; ipr=3D&quot;trust200902&quot;&gt;</span=
><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&lt;rfc category=3D&quot;std&quot; docName=3D&quot;d=
raft-ietf-roll-efficient-npdao-16&quot; ipr=3D&quot;trust200902&quot;&gt;</=
span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp; &lt;!-- category values: std, bcp, info, exp=
, and historic</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ipr values: full3667, noMo=
dification3667, noDerivatives3667</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; you can add the attributes=
 updates=3D&quot;NNNN&quot; and obsoletes=3D&quot;NNNN&quot;</span><o:p></o=
:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -582,11 &#43;582,12 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This document specifies a change in=
 the Transit Information Option to</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; contain the &quot;Invalidate previous ro=
ute&quot; (I) flag. This I-flag signals</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; contain the &quot;Invalidate previou=
s route&quot; (I) flag. This 'I' flag signals</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the common ancestor node to generat=
e a DCO on behalf of the</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target node. The I-flag is carried in th=
e Transit Information</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target node with a RPL Status of 130=
 indicating that the address</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; has moved. The 'I' flag is carried i=
n the Transit Information</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Option which augments the reachabil=
ity information for a given</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set of RPL Target(s). Transit Informatio=
n Option with I-flag</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set of RPL Target(s). Transit Inform=
ation Option with 'I' flag</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; set should be carried in the DAO me=
ssage when route</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; invalidation is sought for the corr=
esponding target(s).</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -615,8 &#43;616,8 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The common ancestor node SHOULD gen=
erate a DCO message in</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; response to this I-flag when it sees tha=
t the routing</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; adjacencies have changed for the target.=
 The I-flag is</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; response to this 'I' flag when it se=
es that the routing</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; adjacencies have changed for the tar=
get. The 'I' flag is</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; intended to give the target node co=
ntrol over its own route</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; invalidation, serving as a signal t=
o request DCO generation.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -638,7 &#43;639,7 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8=
 9 0 1</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;</span><o:=
p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-| RPLInstanceID |K|D|&nbsp;&nbsp; Flags&nbsp;&nbsp; |&nb=
sp;&nbsp; Reserved&nbsp;&nbsp;&nbsp; | DCOSequence&nbsp;&nbsp; |</span><o:p=
></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;| RPLInstanceID |K|D|&nbsp;&nbsp; Flags&nbsp;&nbsp; =
|&nbsp; RPL&nbsp; Status&nbsp; | DCOSequence&nbsp;&nbsp; |</span><o:p></o:p=
></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;</span><o:=
p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; |</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -683,8 &#43;684,15 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the sender and MUST be ignored by t=
he receiver.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Reserved: 8-bit unused field. The field =
MUST be initialized to</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; zero by the sender and MUST be ignored b=
y the receiver.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; RPL Status: The RPL Status as define=
d in section 6.5.1 of &lt;xref</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target=3D&quot;RFC6550&quot;/&gt;.</=
span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Indicative of the reason why the DCO=
 happened, the RPL Status</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; MUST NOT be changed as the DCO is pr=
opagated down the route</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; being invalidated.</span><o:p></o:p>=
</p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; This value is informative and does n=
ot affect the behavior of</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the receiver. In particular, unknown=
 values are ignored by the</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; receiver.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Only Rejection Codes (value above 12=
8) are expected in a DCO.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;/t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DCOSequence: 8-bit field incremente=
d at each unique DCO message</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -759,7 &#43;767,7 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 3</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8=
 9 0 1</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;</span><o:=
p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-| RPLInstanceID |D|&nbsp;&nbsp; Flags&nbsp;&nbsp;&nbsp;&=
nbsp; |&nbsp; DCOSequence&nbsp; |&nbsp;&nbsp;&nbsp; Status&nbsp;&nbsp;&nbsp=
;&nbsp; |</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;| RPLInstanceID |D|&nbsp;&nbsp; Flags&nbsp;&nbsp;&nb=
sp;&nbsp; |&nbsp; DCOSequence&nbsp; | DCO-ACK Status|</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#4=
3;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-=
&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;-&#43;</span><o:=
p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">|&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; |</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp; &#43;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -788,8 &#43;796,10 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; copied from=
 the DCOSequence received in the DCO message.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Status: Indicate=
s the completion. Status 0 is defined as</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unqualified acce=
ptance in this specification. Status 1 is</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; DCO-ACK Stat=
us: Indicates the completion. A value of 0 is</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; defined as</=
span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; unqualified =
acceptance in this specification. A value of 1</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; is</span><o:=
p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;defined as =
&quot;No routing-entry for the Target found&quot;. The</span><o:p></o:p></p=
>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; remaining s=
tatus values are reserved as rejection codes.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -910,7 &#43;920,7 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; nodes will =
generate their respective DAOs to update their</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; paths, and =
the previous route invalidation for those nodes</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; should work=
 in the similar manner described for switching</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; node. The depend=
ent node may set the I-flag in the Transit</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;node. The de=
pendent node may set the 'I' flag in the Transit</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Information=
 Option as part of regular DAO so as to</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; request inv=
alidation of previous route from the common</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ancestor no=
de.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -920,7 &#43;930,7 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; of their pa=
rents in turn have decided to switch their</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; parent. Thu=
s for route invalidation the dependent nodes may</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; choose to a=
lways set the 'I' flag in all its DAO message's</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Transit Informat=
ion Option. Note that setting the I-flag is</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Transit Info=
rmation Option. Note that setting the 'I' flag is</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; not counter=
productive even if there is no previous</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; route to be=
 invalidated.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -1103,7 &#43;1113,7 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt=
;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; IANA is requested to allocate bit 1 from the Transit Inform=
ation</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">- &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;Option Flags registry for the I-flag (&lt;xref target=3D&quot;tr=
ansit_opt_changes&quot;/&gt;)</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Option Flags registry for the 'I' flag (&lt;xref target=3D&q=
uot;transit_opt_changes&quot;/&gt;)</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&g=
t;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;sect=
ion title=3D&quot;New Registry for the Destination Cleanup Object (DCO) Fla=
gs&quot;&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &lt;t&gt;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">@@ -1210,22 &#43;1220,29 @@</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; This document introduces the ability for a common ancestor =
node to</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; invalidate a route on behalf of the target node. The common=
</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ancestor node could be directed to do so by the target node=
 using</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; the I-flag in DCO's Transit Information Option. However, the com=
mon</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; the 'I' flag in DCO's Transit Information Option. However, t=
he common</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ancestor node is in a position to unilaterally initiate the=
 route</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; invalidation since it possesses all the required state info=
rmation,</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; namely, the Target address and the corresponding Path Seque=
nce..</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Thus a rogue common ancestor node could initiate such an</s=
pan><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;invalidation and impact the traffic to the target node.</spa=
n><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&g=
t;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt;=
 The DCO carries a RPL Status value, which is informative. New Status</span=
><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; values may be created over time and a node will ignore an un=
known</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; Status value. Which makes it so that the RPL Status field ma=
y be</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; used as a cover channel. But the channel only works once sin=
ce the</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; message destroys its own medium, that is the existing route =
that it</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; is removing.</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;/t&gt=
;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &lt;t&gt=
;</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; This document also introduces an I-flag which is set by the targ=
et</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; This document also introduces an 'I' flag which is set by th=
e target</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; node and used by the ancestor node to initiate a DCO if the=
</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ancestor sees an update in the route adjacency. However,</s=
pan><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; this flag could be spoofed by a malicious 6LR in the path a=
nd can</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; cause invalidation of an existing active path. Note that in=
validation</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; will happen only if the other conditions such as Path Seque=
nce</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; condition is also met. Having said that, such a malicious 6=
LR may</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; spoof a DAO on behalf of the (sub) child with the I-flag set and=
</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&#43;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; spoof a DAO on behalf of the (sub) child with the 'I' flag s=
et and</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; can cause route invalidation on behalf of the (sub) child n=
ode..</span><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; Note that, using existing mechanisms offered by &lt;xref</s=
pan><o:p></o:p></p>
<p class=3D"xmsonormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; target=3D&quot;RFC6550&quot;/&gt;, =
a malicious 6LR might also spoof a DAO with</span><o:p></o:p></p>
<div style=3D"border:none;border-bottom:solid windowtext 1.0pt;padding:0cm =
0cm 1.0pt 0cm">
<p class=3D"xmsonormal">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"xmsonormal">&nbsp;<o:p></o:p></p>
<p class=3D"xmsonormal">Chairs, could we please last call or whatever so we=
 can move on?<o:p></o:p></p>
<p class=3D"xmsonormal">&nbsp;<o:p></o:p></p>
<p class=3D"xmsonormal">Many thanks!<o:p></o:p></p>
<p class=3D"xmsonormal">&nbsp;<o:p></o:p></p>
<p class=3D"xmsonormal">Pascal<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">_______________________________________________<br>
Roll mailing list<br>
<a href=3D"mailto:Roll@ietf.org" target=3D"_blank">Roll@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/roll" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/roll</a><o:p></o:p></p>
</blockquote>
</div>
</div>
</div>
</div>
</body>
</html>

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The erratum seems to have been reported long back.
Final updates: https://github.com/roll-wg/efficient-route-invalidation/comm=
it/9fff6e6051c2a2560bddd3f5097bf19149edd52a

On Thu, 5 Sep 2019 at 12:01, Pascal Thubert (pthubert)
<pthubert@cisco.com> wrote:
>
> Hello Rahul
>
>
>
> RPL says
>
>
>
>      1-127:  Not an outright rejection; the node sending the DAO-ACK
>
>                is willing to act as a parent, but the receiving node is
>
>                suggested to find and use an alternate parent instead.
>
>      127-255:  Rejection; the node sending the DAO-ACK is unwilling to
>
>                act as a parent.
>
>
>
>
>
> Note that the 127 as a rejection is a typo. The intent was that 127 is no=
t a rejection. We could write an erratum for this I guess so rejection star=
ts at 128.
>
>
>
> All the best,
>
>
>
> Pascal
>
>
>
> From: Rahul Jadhav <nyrahul@outlook.com>
> Sent: jeudi 5 septembre 2019 05:44
> To: Pascal Thubert (pthubert) <pthubert@cisco.com>; Routing Over Low powe=
r and Lossy networks <roll@ietf.org>
> Subject: Re: [Roll] giving back MPDAO to RFC editor
>
>
>
> Thank you Pascal for the changes and pull request.
>
> Have merged the changes.
>
> I made two minor changes, please check if there are ok:
>
> https://github.com/roll-wg/efficient-route-invalidation/commit/8af38e8f44=
b963987ee6754d644d6ef70409462f
>
>
>
> If yes, then please use the latest xml from
>
> https://github.com/roll-wg/efficient-route-invalidation/blob/master/draft=
-ietf-roll-efficient-npdao.xml
>
>
>
> Thanks,
>
> Rahul
>
> ________________________________
>
> From: Roll <roll-bounces@ietf.org> on behalf of Ines Robles <mariainesrob=
les=3D40googlemail.com@dmarc.ietf.org>
> Sent: Wednesday, September 4, 2019 10:33 AM
> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
> Cc: roll <roll@ietf.org>
> Subject: Re: [Roll] giving back MPDAO to RFC editor
>
>
>
> Hi Pascal,
>
>
>
> Thank you very much for your hard work.
>
>
>
> Could you please convert the draft-ietf-roll-efficient-npdao-16.xml to tx=
t [https://xml2rfc.tools.ietf.org/] and put them here https://github.com/ro=
ll-wg/efficient-route-invalidation, so people can read the complete documen=
t with the proposed changes, thus we can have a last call.
>
>
>
> Many thanks again,
>
>
>
> Ines and Peter.
>
>
>
>
>
>
>
> On Wed, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthubert) <pthubert@cisco.=
com> wrote:
>
> Dear all
>
>
>
> We are holding NP DAO for a change that does not impact the behavior of t=
he node but improves traceability.
>
> I would like to confirm consensus on this change rapidly so we can give t=
he doc back to RFC editor.
>
>
>
> The proposed change is as follows:
>
>
>
> ----------------------------------
>
>
>
> diff --git "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-ro=
ll-efficient-npdao-15.xml" "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\=
\draft-ietf-roll-efficient-npdao-16.xml"
>
> index 8a0acca..2ed0920 100644
>
> --- "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effi=
cient-npdao-15.xml"
>
> +++ "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-effi=
cient-npdao-16.xml"
>
> @@ -35,7 +35,7 @@
>
> <?rfc subcompact=3D"yes" ?>
>
> <!-- keep one blank line between list items -->
>
> <!-- end of list of popular I-D processing instructions -->
>
> -<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-15" ipr=
=3D"trust200902">
>
> +<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-16" ipr=
=3D"trust200902">
>
>    <!-- category values: std, bcp, info, exp, and historic
>
>       ipr values: full3667, noModification3667, noDerivatives3667
>
>       you can add the attributes updates=3D"NNNN" and obsoletes=3D"NNNN"
>
> @@ -582,11 +582,12 @@
>
>
>
>              <t>
>
>                  This document specifies a change in the Transit Informat=
ion Option to
>
> -                contain the "Invalidate previous route" (I) flag. This I=
-flag signals
>
> +                contain the "Invalidate previous route" (I) flag. This '=
I' flag signals
>
>                  the common ancestor node to generate a DCO on behalf of =
the
>
> -                target node. The I-flag is carried in the Transit Inform=
ation
>
> +                target node with a RPL Status of 130 indicating that the=
 address
>
> +                has moved. The 'I' flag is carried in the Transit Inform=
ation
>
>                  Option which augments the reachability information for a=
 given
>
> -                set of RPL Target(s). Transit Information Option with I-=
flag
>
> +                set of RPL Target(s). Transit Information Option with 'I=
' flag
>
>                  set should be carried in the DAO message when route
>
>                  invalidation is sought for the corresponding target(s).
>
>              </t>
>
> @@ -615,8 +616,8 @@
>
>              </t>
>
>              <t>
>
>                  The common ancestor node SHOULD generate a DCO message i=
n
>
> -                response to this I-flag when it sees that the routing
>
> -                adjacencies have changed for the target. The I-flag is
>
> +                response to this 'I' flag when it sees that the routing
>
> +                adjacencies have changed for the target. The 'I' flag is
>
>                  intended to give the target node control over its own ro=
ute
>
>                  invalidation, serving as a signal to request DCO generat=
ion.
>
>              </t>
>
> @@ -638,7 +639,7 @@
>
> 0                   1                   2                   3
>
> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> -| RPLInstanceID |K|D|   Flags   |   Reserved    | DCOSequence   |
>
> +| RPLInstanceID |K|D|   Flags   |  RPL  Status  | DCOSequence   |
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> |                                                               |
>
> +                                                               +
>
> @@ -683,8 +684,15 @@
>
>                  the sender and MUST be ignored by the receiver.
>
>              </t>
>
>              <t>
>
> -                Reserved: 8-bit unused field. The field MUST be initiali=
zed to
>
> -                zero by the sender and MUST be ignored by the receiver.
>
> +                RPL Status: The RPL Status as defined in section 6.5.1 o=
f <xref
>
> +                target=3D"RFC6550"/>.
>
> +                Indicative of the reason why the DCO happened, the RPL S=
tatus
>
> +                MUST NOT be changed as the DCO is propagated down the ro=
ute
>
> +                being invalidated.
>
> +                This value is informative and does not affect the behavi=
or of
>
> +                the receiver. In particular, unknown values are ignored =
by the
>
> +                receiver.
>
> +                Only Rejection Codes (value above 128) are expected in a=
 DCO.
>
>              </t>
>
>              <t>
>
>                  DCOSequence: 8-bit field incremented at each unique DCO =
message
>
> @@ -759,7 +767,7 @@
>
> 0                   1                   2                   3
>
> 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> -| RPLInstanceID |D|   Flags     |  DCOSequence  |    Status     |
>
> +| RPLInstanceID |D|   Flags     |  DCOSequence  | DCO-ACK Status|
>
> +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
>
> |                                                               |
>
> +                                                               +
>
> @@ -788,8 +796,10 @@
>
>                      copied from the DCOSequence received in the DCO mess=
age.
>
>                  </t>
>
>                  <t>
>
> -                    Status: Indicates the completion. Status 0 is define=
d as
>
> -                    unqualified acceptance in this specification. Status=
 1 is
>
> +                    DCO-ACK Status: Indicates the completion. A value of=
 0 is
>
> +                    defined as
>
> +                    unqualified acceptance in this specification. A valu=
e of 1
>
> +                    is
>
>                      defined as "No routing-entry for the Target found". =
The
>
>                      remaining status values are reserved as rejection co=
des.
>
>                  </t>
>
> @@ -910,7 +920,7 @@
>
>                      nodes will generate their respective DAOs to update =
their
>
>                      paths, and the previous route invalidation for those=
 nodes
>
>                      should work in the similar manner described for swit=
ching
>
> -                    node. The dependent node may set the I-flag in the T=
ransit
>
> +                    node. The dependent node may set the 'I' flag in the=
 Transit
>
>                      Information Option as part of regular DAO so as to
>
>                      request invalidation of previous route from the comm=
on
>
>                      ancestor node.
>
> @@ -920,7 +930,7 @@
>
>                      of their parents in turn have decided to switch thei=
r
>
>                      parent. Thus for route invalidation the dependent no=
des may
>
>                      choose to always set the 'I' flag in all its DAO mes=
sage's
>
> -                    Transit Information Option. Note that setting the I-=
flag is
>
> +                    Transit Information Option. Note that setting the 'I=
' flag is
>
>                      not counterproductive even if there is no previous
>
>                      route to be invalidated.
>
>                  </t>
>
> @@ -1103,7 +1113,7 @@
>
>
>
>          <t>
>
>              IANA is requested to allocate bit 1 from the Transit Informa=
tion
>
> -            Option Flags registry for the I-flag (<xref target=3D"transi=
t_opt_changes"/>)
>
> +            Option Flags registry for the 'I' flag (<xref target=3D"tran=
sit_opt_changes"/>)
>
>          </t>
>
>          <section title=3D"New Registry for the Destination Cleanup Objec=
t (DCO) Flags">
>
>              <t>
>
> @@ -1210,22 +1220,29 @@
>
>              This document introduces the ability for a common ancestor n=
ode to
>
>              invalidate a route on behalf of the target node. The common
>
>              ancestor node could be directed to do so by the target node =
using
>
> -            the I-flag in DCO's Transit Information Option. However, the=
 common
>
> +            the 'I' flag in DCO's Transit Information Option. However, t=
he common
>
>              ancestor node is in a position to unilaterally initiate the =
route
>
>              invalidation since it possesses all the required state infor=
mation,
>
>              namely, the Target address and the corresponding Path Sequen=
ce..
>
>              Thus a rogue common ancestor node could initiate such an
>
>             invalidation and impact the traffic to the target node.
>
>          </t>
>
> +        <t> The DCO carries a RPL Status value, which is informative. Ne=
w Status
>
> +            values may be created over time and a node will ignore an un=
known
>
> +            Status value. Which makes it so that the RPL Status field ma=
y be
>
> +            used as a cover channel. But the channel only works once sin=
ce the
>
> +            message destroys its own medium, that is the existing route =
that it
>
> +            is removing.
>
> +        </t>
>
>          <t>
>
> -            This document also introduces an I-flag which is set by the =
target
>
> +            This document also introduces an 'I' flag which is set by th=
e target
>
>              node and used by the ancestor node to initiate a DCO if the
>
>              ancestor sees an update in the route adjacency. However,
>
>              this flag could be spoofed by a malicious 6LR in the path an=
d can
>
>              cause invalidation of an existing active path. Note that inv=
alidation
>
>              will happen only if the other conditions such as Path Sequen=
ce
>
>              condition is also met. Having said that, such a malicious 6L=
R may
>
> -            spoof a DAO on behalf of the (sub) child with the I-flag set=
 and
>
> +            spoof a DAO on behalf of the (sub) child with the 'I' flag s=
et and
>
>              can cause route invalidation on behalf of the (sub) child no=
de..
>
>              Note that, using existing mechanisms offered by <xref
>
>                  target=3D"RFC6550"/>, a malicious 6LR might also spoof a=
 DAO with
>
>
>
>
>
> Chairs, could we please last call or whatever so we can move on?
>
>
>
> Many thanks!
>
>
>
> Pascal
>
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll
>
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll


From nobody Thu Sep  5 00:09:18 2019
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] giving back MPDAO to RFC editor
Thread-Index: AdVjB/JIrm5BouKOTamY5+QcgzHTjqccbzTnpxsrrVCxycMngP///SVQ
Date: Thu, 5 Sep 2019 07:08:52 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/mssgbLUahUa6TVRMEXh1tTDpIpE>
Subject: Re: [Roll] giving back MPDAO to RFC editor
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Cool.=20

I created a pull request, also fixing the area tag. Seems you did too, so n=
ow we are conflicting : )=20
I'll let you handle it with the change that you prefer.

All the best,

Pascal

> -----Original Message-----
> From: Roll <roll-bounces@ietf.org> On Behalf Of Rahul Jadhav
> Sent: jeudi 5 septembre 2019 08:56
> To: Routing Over Low power and Lossy networks <roll@ietf.org>
> Subject: Re: [Roll] giving back MPDAO to RFC editor
>=20
> The erratum seems to have been reported long back.
> Final updates: https://github.com/roll-wg/efficient-route-
> invalidation/commit/9fff6e6051c2a2560bddd3f5097bf19149edd52a
>=20
> On Thu, 5 Sep 2019 at 12:01, Pascal Thubert (pthubert) <pthubert@cisco.co=
m>
> wrote:
> >
> > Hello Rahul
> >
> >
> >
> > RPL says
> >
> >
> >
> >      1-127:  Not an outright rejection; the node sending the DAO-ACK
> >
> >                is willing to act as a parent, but the receiving node
> > is
> >
> >                suggested to find and use an alternate parent instead.
> >
> >      127-255:  Rejection; the node sending the DAO-ACK is unwilling to
> >
> >                act as a parent.
> >
> >
> >
> >
> >
> > Note that the 127 as a rejection is a typo. The intent was that 127 is =
not a
> rejection. We could write an erratum for this I guess so rejection starts=
 at 128.
> >
> >
> >
> > All the best,
> >
> >
> >
> > Pascal
> >
> >
> >
> > From: Rahul Jadhav <nyrahul@outlook.com>
> > Sent: jeudi 5 septembre 2019 05:44
> > To: Pascal Thubert (pthubert) <pthubert@cisco.com>; Routing Over Low
> > power and Lossy networks <roll@ietf.org>
> > Subject: Re: [Roll] giving back MPDAO to RFC editor
> >
> >
> >
> > Thank you Pascal for the changes and pull request.
> >
> > Have merged the changes.
> >
> > I made two minor changes, please check if there are ok:
> >
> > https://github.com/roll-wg/efficient-route-invalidation/commit/8af38e8
> > f44b963987ee6754d644d6ef70409462f
> >
> >
> >
> > If yes, then please use the latest xml from
> >
> > https://github.com/roll-wg/efficient-route-invalidation/blob/master/dr
> > aft-ietf-roll-efficient-npdao.xml
> >
> >
> >
> > Thanks,
> >
> > Rahul
> >
> > ________________________________
> >
> > From: Roll <roll-bounces@ietf.org> on behalf of Ines Robles
> > <mariainesrobles=3D40googlemail.com@dmarc.ietf.org>
> > Sent: Wednesday, September 4, 2019 10:33 AM
> > To: Pascal Thubert (pthubert) <pthubert@cisco.com>
> > Cc: roll <roll@ietf.org>
> > Subject: Re: [Roll] giving back MPDAO to RFC editor
> >
> >
> >
> > Hi Pascal,
> >
> >
> >
> > Thank you very much for your hard work.
> >
> >
> >
> > Could you please convert the draft-ietf-roll-efficient-npdao-16.xml to =
txt
> [https://xml2rfc.tools.ietf.org/] and put them here https://github.com/ro=
ll-
> wg/efficient-route-invalidation, so people can read the complete document
> with the proposed changes, thus we can have a last call.
> >
> >
> >
> > Many thanks again,
> >
> >
> >
> > Ines and Peter.
> >
> >
> >
> >
> >
> >
> >
> > On Wed, Sep 4, 2019 at 1:10 PM Pascal Thubert (pthubert)
> <pthubert@cisco.com> wrote:
> >
> > Dear all
> >
> >
> >
> > We are holding NP DAO for a change that does not impact the behavior of
> the node but improves traceability.
> >
> > I would like to confirm consensus on this change rapidly so we can give=
 the
> doc back to RFC editor.
> >
> >
> >
> > The proposed change is as follows:
> >
> >
> >
> > ----------------------------------
> >
> >
> >
> > diff --git "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-=
roll-
> efficient-npdao-15.xml"
> "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-efficien=
t-
> npdao-16.xml"
> >
> > index 8a0acca..2ed0920 100644
> >
> > --- "a/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-
> efficient-npdao-15.xml"
> >
> > +++ "b/C:\\Users\\pthubert\\Dropbox\\IETF\\doc\\rpi\\draft-ietf-roll-
> efficient-npdao-16.xml"
> >
> > @@ -35,7 +35,7 @@
> >
> > <?rfc subcompact=3D"yes" ?>
> >
> > <!-- keep one blank line between list items -->
> >
> > <!-- end of list of popular I-D processing instructions -->
> >
> > -<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-15"
> > ipr=3D"trust200902">
> >
> > +<rfc category=3D"std" docName=3D"draft-ietf-roll-efficient-npdao-16"
> > +ipr=3D"trust200902">
> >
> >    <!-- category values: std, bcp, info, exp, and historic
> >
> >       ipr values: full3667, noModification3667, noDerivatives3667
> >
> >       you can add the attributes updates=3D"NNNN" and obsoletes=3D"NNNN=
"
> >
> > @@ -582,11 +582,12 @@
> >
> >
> >
> >              <t>
> >
> >                  This document specifies a change in the Transit
> > Information Option to
> >
> > -                contain the "Invalidate previous route" (I) flag. This=
 I-flag signals
> >
> > +                contain the "Invalidate previous route" (I) flag.
> > + This 'I' flag signals
> >
> >                  the common ancestor node to generate a DCO on behalf
> > of the
> >
> > -                target node. The I-flag is carried in the Transit Info=
rmation
> >
> > +                target node with a RPL Status of 130 indicating that
> > + the address
> >
> > +                has moved. The 'I' flag is carried in the Transit
> > + Information
> >
> >                  Option which augments the reachability information
> > for a given
> >
> > -                set of RPL Target(s). Transit Information Option with =
I-flag
> >
> > +                set of RPL Target(s). Transit Information Option with
> > + 'I' flag
> >
> >                  set should be carried in the DAO message when route
> >
> >                  invalidation is sought for the corresponding target(s)=
.
> >
> >              </t>
> >
> > @@ -615,8 +616,8 @@
> >
> >              </t>
> >
> >              <t>
> >
> >                  The common ancestor node SHOULD generate a DCO
> > message in
> >
> > -                response to this I-flag when it sees that the routing
> >
> > -                adjacencies have changed for the target. The I-flag is
> >
> > +                response to this 'I' flag when it sees that the
> > + routing
> >
> > +                adjacencies have changed for the target. The 'I' flag
> > + is
> >
> >                  intended to give the target node control over its own
> > route
> >
> >                  invalidation, serving as a signal to request DCO gener=
ation.
> >
> >              </t>
> >
> > @@ -638,7 +639,7 @@
> >
> > 0                   1                   2                   3
> >
> > 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >
> > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >
> > -| RPLInstanceID |K|D|   Flags   |   Reserved    | DCOSequence   |
> >
> > +| RPLInstanceID |K|D|   Flags   |  RPL  Status  | DCOSequence   |
> >
> > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >
> > |                                                               |
> >
> > +                                                               +
> >
> > @@ -683,8 +684,15 @@
> >
> >                  the sender and MUST be ignored by the receiver.
> >
> >              </t>
> >
> >              <t>
> >
> > -                Reserved: 8-bit unused field. The field MUST be initia=
lized to
> >
> > -                zero by the sender and MUST be ignored by the receiver=
.
> >
> > +                RPL Status: The RPL Status as defined in section
> > + 6.5.1 of <xref
> >
> > +                target=3D"RFC6550"/>.
> >
> > +                Indicative of the reason why the DCO happened, the
> > + RPL Status
> >
> > +                MUST NOT be changed as the DCO is propagated down the
> > + route
> >
> > +                being invalidated.
> >
> > +                This value is informative and does not affect the
> > + behavior of
> >
> > +                the receiver. In particular, unknown values are
> > + ignored by the
> >
> > +                receiver.
> >
> > +                Only Rejection Codes (value above 128) are expected in=
 a DCO.
> >
> >              </t>
> >
> >              <t>
> >
> >                  DCOSequence: 8-bit field incremented at each unique
> > DCO message
> >
> > @@ -759,7 +767,7 @@
> >
> > 0                   1                   2                   3
> >
> > 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> >
> > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >
> > -| RPLInstanceID |D|   Flags     |  DCOSequence  |    Status     |
> >
> > +| RPLInstanceID |D|   Flags     |  DCOSequence  | DCO-ACK Status|
> >
> > +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
> >
> > |                                                               |
> >
> > +                                                               +
> >
> > @@ -788,8 +796,10 @@
> >
> >                      copied from the DCOSequence received in the DCO me=
ssage.
> >
> >                  </t>
> >
> >                  <t>
> >
> > -                    Status: Indicates the completion. Status 0 is defi=
ned as
> >
> > -                    unqualified acceptance in this specification. Stat=
us 1 is
> >
> > +                    DCO-ACK Status: Indicates the completion. A value
> > + of 0 is
> >
> > +                    defined as
> >
> > +                    unqualified acceptance in this specification. A
> > + value of 1
> >
> > +                    is
> >
> >                      defined as "No routing-entry for the Target
> > found". The
> >
> >                      remaining status values are reserved as rejection =
codes.
> >
> >                  </t>
> >
> > @@ -910,7 +920,7 @@
> >
> >                      nodes will generate their respective DAOs to
> > update their
> >
> >                      paths, and the previous route invalidation for
> > those nodes
> >
> >                      should work in the similar manner described for
> > switching
> >
> > -                    node. The dependent node may set the I-flag in the=
 Transit
> >
> > +                    node. The dependent node may set the 'I' flag in
> > + the Transit
> >
> >                      Information Option as part of regular DAO so as
> > to
> >
> >                      request invalidation of previous route from the
> > common
> >
> >                      ancestor node.
> >
> > @@ -920,7 +930,7 @@
> >
> >                      of their parents in turn have decided to switch
> > their
> >
> >                      parent. Thus for route invalidation the dependent
> > nodes may
> >
> >                      choose to always set the 'I' flag in all its DAO
> > message's
> >
> > -                    Transit Information Option. Note that setting the =
I-flag is
> >
> > +                    Transit Information Option. Note that setting the
> > + 'I' flag is
> >
> >                      not counterproductive even if there is no
> > previous
> >
> >                      route to be invalidated.
> >
> >                  </t>
> >
> > @@ -1103,7 +1113,7 @@
> >
> >
> >
> >          <t>
> >
> >              IANA is requested to allocate bit 1 from the Transit
> > Information
> >
> > -            Option Flags registry for the I-flag (<xref
> target=3D"transit_opt_changes"/>)
> >
> > +            Option Flags registry for the 'I' flag (<xref
> > + target=3D"transit_opt_changes"/>)
> >
> >          </t>
> >
> >          <section title=3D"New Registry for the Destination Cleanup
> > Object (DCO) Flags">
> >
> >              <t>
> >
> > @@ -1210,22 +1220,29 @@
> >
> >              This document introduces the ability for a common
> > ancestor node to
> >
> >              invalidate a route on behalf of the target node. The
> > common
> >
> >              ancestor node could be directed to do so by the target
> > node using
> >
> > -            the I-flag in DCO's Transit Information Option. However, t=
he common
> >
> > +            the 'I' flag in DCO's Transit Information Option.
> > + However, the common
> >
> >              ancestor node is in a position to unilaterally initiate
> > the route
> >
> >              invalidation since it possesses all the required state
> > information,
> >
> >              namely, the Target address and the corresponding Path Sequ=
ence..
> >
> >              Thus a rogue common ancestor node could initiate such an
> >
> >             invalidation and impact the traffic to the target node.
> >
> >          </t>
> >
> > +        <t> The DCO carries a RPL Status value, which is informative.
> > + New Status
> >
> > +            values may be created over time and a node will ignore an
> > + unknown
> >
> > +            Status value. Which makes it so that the RPL Status field
> > + may be
> >
> > +            used as a cover channel. But the channel only works once
> > + since the
> >
> > +            message destroys its own medium, that is the existing
> > + route that it
> >
> > +            is removing.
> >
> > +        </t>
> >
> >          <t>
> >
> > -            This document also introduces an I-flag which is set by th=
e target
> >
> > +            This document also introduces an 'I' flag which is set by
> > + the target
> >
> >              node and used by the ancestor node to initiate a DCO if
> > the
> >
> >              ancestor sees an update in the route adjacency. However,
> >
> >              this flag could be spoofed by a malicious 6LR in the path
> > and can
> >
> >              cause invalidation of an existing active path. Note that
> > invalidation
> >
> >              will happen only if the other conditions such as Path
> > Sequence
> >
> >              condition is also met. Having said that, such a malicious
> > 6LR may
> >
> > -            spoof a DAO on behalf of the (sub) child with the I-flag s=
et and
> >
> > +            spoof a DAO on behalf of the (sub) child with the 'I'
> > + flag set and
> >
> >              can cause route invalidation on behalf of the (sub) child =
node..
> >
> >              Note that, using existing mechanisms offered by <xref
> >
> >                  target=3D"RFC6550"/>, a malicious 6LR might also spoof
> > a DAO with
> >
> >
> >
> >
> >
> > Chairs, could we please last call or whatever so we can move on?
> >
> >
> >
> > Many thanks!
> >
> >
> >
> > Pascal
> >
> > _______________________________________________
> > Roll mailing list
> > Roll@ietf.org
> > https://www.ietf.org/mailman/listinfo/roll
> >
> > _______________________________________________
> > Roll mailing list
> > Roll@ietf.org
> > https://www.ietf.org/mailman/listinfo/roll
>=20
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll


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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: compiling the todos on P DAO
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Subject: [Roll] compiling the todos on P DAO
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Dear all:

I'm willing to make a pass on the P-DAO to address the points that we made =
at the WG meeting at IETF 105 and continued on the ML around July 25 to 27,=
 2019.
I'll summarize my todo list below, please correct me if I misunderstood or =
missed items, and please use the relevant thread below to continue the disc=
ussion as needed:

https://mailarchive.ietf.org/arch/msg/roll/Z-ZZzL-NAVfgJAir35gG6YtCpkU Sibl=
ing information
We discussed the need to provide not only alternate parents but also links =
to siblings to the root. The siblings links would be for computing P2P rout=
es that are not along the DODAG, e.g., non storing p-routes. We need meta l=
ike step of rank signaled for both parents and siblings. Also, we probably =
want that only one of the siblings advertises the link.

https://mailarchive.ietf.org/arch/msg/roll/b4D20dCabKgFrpxDuxs-1bZJRxQ Quer=
ying PDAO
We discussed the need for a node to ask for a path with one or more destina=
tion and constraints. We discussed the use of a DIS with constraints that w=
e could express using RFC 6551 I guess.

https://mailarchive.ietf.org/arch/msg/roll/59IYmAmLoC1eLvS3GO8zYfTG7c0 Stit=
ching PDAO segments
It takes a collection of segments to build a 6TiSCH Track. We need to signa=
l that segments that we install separately belong to a same Track.

https://mailarchive.ietf.org/arch/msg/roll/KkcJYTjpMrOFvLbPhbLME0o1E1w Comp=
ressing the PDAO natively
Basically use RFC 8138 to compress the VIA option.

Anything else?

Pascal


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<p class=3D"MsoNormal">Dear all:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;m willing to make a pass on the P-DAO to add=
ress the points that we made at the WG meeting at IETF 105 and continued on=
 the ML around July 25 to 27, 2019.<o:p></o:p></p>
<p class=3D"MsoNormal">I&#8217;ll summarize my todo list below, please corr=
ect me if I misunderstood or missed items, and please use the relevant thre=
ad below to continue the discussion as needed:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://mailarchive.ietf.org/arch/msg/rol=
l/Z-ZZzL-NAVfgJAir35gG6YtCpkU">https://mailarchive.ietf.org/arch/msg/roll/Z=
-ZZzL-NAVfgJAir35gG6YtCpkU</a>
<b>Sibling information</b><o:p></o:p></p>
<p class=3D"MsoNormal">We discussed the need to provide not only alternate =
parents but also links to siblings to the root. The siblings links would be=
 for computing P2P routes that are not along the DODAG, e.g., non storing p=
-routes. We need meta like step of
 rank signaled for both parents and siblings. Also, we probably want that o=
nly one of the siblings advertises the link.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://mailarchive.ietf.org/arch/msg/rol=
l/b4D20dCabKgFrpxDuxs-1bZJRxQ">https://mailarchive.ietf.org/arch/msg/roll/b=
4D20dCabKgFrpxDuxs-1bZJRxQ</a>
<b>Querying PDAO</b><o:p></o:p></p>
<p class=3D"MsoNormal">We discussed the need for a node to ask for a path w=
ith one or more destination and constraints. We discussed the use of a DIS =
with constraints that we could express using RFC 6551 I guess.<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://mailarchive.ietf.org/arch/msg/rol=
l/59IYmAmLoC1eLvS3GO8zYfTG7c0">https://mailarchive.ietf.org/arch/msg/roll/5=
9IYmAmLoC1eLvS3GO8zYfTG7c0</a>
<b>Stitching PDAO segments <o:p></o:p></b></p>
<p class=3D"MsoNormal">It takes a collection of segments to build a 6TiSCH =
Track. We need to signal that segments that we install separately belong to=
 a same Track.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://mailarchive.ietf.org/arch/msg/rol=
l/KkcJYTjpMrOFvLbPhbLME0o1E1w">https://mailarchive.ietf.org/arch/msg/roll/K=
kcJYTjpMrOFvLbPhbLME0o1E1w</a>
<b>Compressing the PDAO natively<o:p></o:p></b></p>
<p class=3D"MsoNormal">Basically use RFC 8138 to compress the VIA option.<o=
:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Anything else?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</body>
</html>

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: P-DAO requirements on MOP-ext
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Subject: [Roll] P-DAO requirements on MOP-ext
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Dear all

I'm looking at what P-DAO would need to express as capabilities.
Here's a list, please come back with more:


  *   Express support for RFC 8138 (needed for draft-thubert-roll-turnon-rf=
c8138 as well)
  *   Express support for exposing siblings
  *   Signal supported OFs
  *   Express support for storing P-DAO
  *   Express the capacity in terms of routes {
     *   approximate Nb of routes that can be installed,
     *   Current % route storage used,
     *   Target % route storage used - if target < current then Root should=
 move some paths
     *   overload bit that means do not use me for now }
  *   Same for non-storing P-DAO using an average number of hops per route,=
 e.g., 5.
     *   Plus: Maximum nb hops in a route

What do you think?

Pascal




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<p class=3D"MsoNormal">Dear all<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I&#8217;m looking at what P-DAO would need to expres=
s as capabilities.<o:p></o:p></p>
<p class=3D"MsoNormal">Here&#8217;s a list, please come back with more: <o:=
p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<ul style=3D"margin-top:0cm" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo1">Express support for RFC 8138 (needed for draft-thubert-roll-turnon-rf=
c8138 as well)<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margi=
n-left:0cm;mso-list:l0 level1 lfo1">Express support for exposing siblings<o=
:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-l=
ist:l0 level1 lfo1">Signal supported OFs<o:p></o:p></li><li class=3D"MsoLis=
tParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 lfo1">Express suppo=
rt for storing P-DAO<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D=
"margin-left:0cm;mso-list:l0 level1 lfo1">Express the capacity in terms of =
routes {<o:p></o:p></li><ul style=3D"margin-top:0cm" type=3D"circle">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level2 =
lfo1">approximate Nb of routes that can be installed,
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso=
-list:l0 level2 lfo1">Current % route storage used,
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso=
-list:l0 level2 lfo1">Target % route storage used - if target &lt; current =
then Root should move some paths<o:p></o:p></li><li class=3D"MsoListParagra=
ph" style=3D"margin-left:0cm;mso-list:l0 level2 lfo1">overload bit that mea=
ns do not use me for now }<o:p></o:p></li></ul>
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level1 =
lfo1">Same for non-storing P-DAO using an average number of hops per route,=
 e.g., 5.<o:p></o:p></li><ul style=3D"margin-top:0cm" type=3D"circle">
<li class=3D"MsoListParagraph" style=3D"margin-left:0cm;mso-list:l0 level2 =
lfo1">Plus: Maximum nb hops in a route<o:p></o:p></li></ul>
</ul>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">What do you think?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Pascal<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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Subject: [Roll] I-D Action: draft-ietf-roll-efficient-npdao-16.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Routing Over Low power and Lossy networks WG of the IETF.

        Title           : Efficient Route Invalidation
        Authors         : Rahul Arvind Jadhav
                          Pascal Thubert
                          Rabi Narayan Sahoo
                          Zhen Cao
	Filename        : draft-ietf-roll-efficient-npdao-16.txt
	Pages           : 23
	Date            : 2019-09-05

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


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-roll-efficient-npdao-16
https://datatracker.ietf.org/doc/html/draft-ietf-roll-efficient-npdao-16

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-roll-efficient-npdao-16


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

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


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From: Rahul Jadhav <rahul.ietf@gmail.com>
Date: Fri, 6 Sep 2019 13:32:27 +0530
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
Cc: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Roll] ROLL Interim Meeting - September
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Hi Ines, All,

Have posted initial slides for interim discussion based on inputs from
Michael and Pascal.
Ines, please check and accept the PR:
https://github.com/roll-wg/ROLL-Interim-Meeting/pull/1

If anyone wants to add any slides, the original odp (can be opened
using libreoffice-impress) is uploaded in PR.
Let us know if any points have to be added further.

Thanks,
Rahul

On Tue, 3 Sep 2019 at 16:25, Ines Robles
<mariainesrobles=40googlemail.com@dmarc.ietf.org> wrote:
>
> Dear all,
>
> In this repository we will track the organization of the Interim meeting.
>
> https://github.com/roll-wg/ROLL-Interim-Meeting
>
> Thank you,
>
> Ines.
>
> On Tue, Sep 3, 2019 at 9:33 AM Ines Robles <mariainesrobles@googlemail.com> wrote:
>>
>> Dear all,
>>
>> We will host a ROLL Interim Meeting to discuss about capabilities and status of NPDAO..
>>
>> Please fill the doodle by this Friday 6th September.
>>
>> https://doodle.com/poll/d3afe32xra2pg675
>>
>> We will send more information later: agenda, etherpad for minutes, etc.
>>
>> Let us know if you desire to discuss about additional topics or other dates fits better for you (note that the interim meeting have to be announced two weeks in advance [1])
>>
>> Thank you,
>>
>> Ines, Peter and Michael
>>
>> [1] https://www.ietf.org/how/meetings/interim/
>>
>>
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll


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Comments: In-reply-to "Pascal Thubert (pthubert)" <pthubert@cisco.com> message dated "Thu, 05 Sep 2019 14:25:26 -0000."
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Subject: Re: [Roll] P-DAO requirements on MOP-ext
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--=-=-=
Content-Type: text/plain
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Thank you; these are really good questions.

pascal> I'm looking at what P-DAO would need to express as capabilities.
pascal> Here's a list, please come back with more:

I am re-ordering slightly.

pascal>   *   Signal supported OFs
pascal>   *   Express support for RFC 8138 (needed for draft-thubert-roll-t=
urnon-rfc8138 as well)

It seems like these are capabilities separate from P-DAO itself.
That these are things that could be enabled or not even without P-DAO.
That P-DAO could run without them.  Is that correct, or is there a dependan=
cy
that I'm ignorant of?

pascal>   *   Express support for exposing siblings

I guess I need to read P-DAO again to understand why this isn't part of P-D=
AO.

pascal>   *   Express support for storing P-DAO
pascal>   *   Express the capacity in terms of routes {
pascal>      *   approximate Nb of routes that can be installed,
pascal>      *   Current % route storage used,
pascal>      *   Target % route storage used - if target < current then Roo=
t should move some paths
pascal>      *   overload bit that means do not use me for now }

Clearly if you say you support P-DAO, then you also need to say how many
routes you can support.  In non-storing mode, the node would store zero
routes, so the root would always know how many routes there are, and does n=
ot
need to know % and target, does it?
In storing mode, it seems that the root won't learn how much space there is
at each level from the DAOs, just how many routes are used in each directly
children, so we do need to know how many are used and how much space there
is.

Clearly, how many are used, and the overload bit are things that need to
updated regularly, while the total capacity is updated once.

I suggest therefore that what we need to do is to inform the root on a
periodic basis how many available slots there are.  This would seem to
capture all of the data you indicate into a single number?

pascal>   *   Same for non-storing P-DAO using an average number of hops pe=
r route, e.g., 5.
pascal>      *   Plus: Maximum nb hops in a route

Your thought is that a node will have X many slots for "hops", and that a
route would consist of a some number of hops, so that it's not destinations
that we need to account for, but rather hops?

I feel that the amount of active space does not really fit into capabilities
as I had originally imagined.  That capabilities are something that are
communicated once after the node joins a particular DODAG. While available
slots for hops is something that requires more frequent updates and should
use a different mechanism. But perhaps I'm thinking too much about this,
and that one mechanism can do both.

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


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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Sun, 8 Sep 2019 10:19:26 +0300
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To: Routing Over Low power and Lossy networks <roll@ietf.org>
Cc: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Roll] ROLL Interim Meeting - September
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Thank you very much Rahul!! :)

On Fri, Sep 6, 2019 at 11:02 AM Rahul Jadhav <rahul.ietf@gmail.com> wrote:

> Hi Ines, All,
>
> Have posted initial slides for interim discussion based on inputs from
> Michael and Pascal.
> Ines, please check and accept the PR:
> https://github.com/roll-wg/ROLL-Interim-Meeting/pull/1
>
> If anyone wants to add any slides, the original odp (can be opened
> using libreoffice-impress) is uploaded in PR.
> Let us know if any points have to be added further.
>
> Thanks,
> Rahul
>
> On Tue, 3 Sep 2019 at 16:25, Ines Robles
> <mariainesrobles=40googlemail.com@dmarc.ietf.org> wrote:
> >
> > Dear all,
> >
> > In this repository we will track the organization of the Interim meeting.
> >
> > https://github.com/roll-wg/ROLL-Interim-Meeting
> >
> > Thank you,
> >
> > Ines.
> >
> > On Tue, Sep 3, 2019 at 9:33 AM Ines Robles <
> mariainesrobles@googlemail.com> wrote:
> >>
> >> Dear all,
> >>
> >> We will host a ROLL Interim Meeting to discuss about capabilities and
> status of NPDAO..
> >>
> >> Please fill the doodle by this Friday 6th September.
> >>
> >> https://doodle.com/poll/d3afe32xra2pg675
> >>
> >> We will send more information later: agenda, etherpad for minutes, etc.
> >>
> >> Let us know if you desire to discuss about additional topics or other
> dates fits better for you (note that the interim meeting have to be
> announced two weeks in advance [1])
> >>
> >> Thank you,
> >>
> >> Ines, Peter and Michael
> >>
> >> [1] https://www.ietf.org/how/meetings/interim/
> >>
> >>
> > _______________________________________________
> > Roll mailing list
> > Roll@ietf.org
> > https://www.ietf.org/mailman/listinfo/roll
>
> _______________________________________________
> Roll mailing list
> Roll@ietf.org
> https://www.ietf.org/mailman/listinfo/roll
>

--0000000000007cd0fc0592057e3a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Thank you very much Rahul!! :)</div><br><div class=3D"gmai=
l_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Sep 6, 2019 at 11:02=
 AM Rahul Jadhav &lt;<a href=3D"mailto:rahul.ietf@gmail.com">rahul.ietf@gma=
il.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left=
:1ex">Hi Ines, All,<br>
<br>
Have posted initial slides for interim discussion based on inputs from<br>
Michael and Pascal.<br>
Ines, please check and accept the PR:<br>
<a href=3D"https://github.com/roll-wg/ROLL-Interim-Meeting/pull/1" rel=3D"n=
oreferrer" target=3D"_blank">https://github.com/roll-wg/ROLL-Interim-Meetin=
g/pull/1</a><br>
<br>
If anyone wants to add any slides, the original odp (can be opened<br>
using libreoffice-impress) is uploaded in PR.<br>
Let us know if any points have to be added further.<br>
<br>
Thanks,<br>
Rahul<br>
<br>
On Tue, 3 Sep 2019 at 16:25, Ines Robles<br>
&lt;mariainesrobles=3D<a href=3D"mailto:40googlemail.com@dmarc.ietf.org" ta=
rget=3D"_blank">40googlemail.com@dmarc.ietf.org</a>&gt; wrote:<br>
&gt;<br>
&gt; Dear all,<br>
&gt;<br>
&gt; In this repository we will track the organization of the Interim meeti=
ng.<br>
&gt;<br>
&gt; <a href=3D"https://github.com/roll-wg/ROLL-Interim-Meeting" rel=3D"nor=
eferrer" target=3D"_blank">https://github.com/roll-wg/ROLL-Interim-Meeting<=
/a><br>
&gt;<br>
&gt; Thank you,<br>
&gt;<br>
&gt; Ines.<br>
&gt;<br>
&gt; On Tue, Sep 3, 2019 at 9:33 AM Ines Robles &lt;<a href=3D"mailto:maria=
inesrobles@googlemail.com" target=3D"_blank">mariainesrobles@googlemail.com=
</a>&gt; wrote:<br>
&gt;&gt;<br>
&gt;&gt; Dear all,<br>
&gt;&gt;<br>
&gt;&gt; We will host a ROLL Interim Meeting to discuss about capabilities =
and status of NPDAO..<br>
&gt;&gt;<br>
&gt;&gt; Please fill the doodle by this Friday 6th September.<br>
&gt;&gt;<br>
&gt;&gt; <a href=3D"https://doodle.com/poll/d3afe32xra2pg675" rel=3D"norefe=
rrer" target=3D"_blank">https://doodle.com/poll/d3afe32xra2pg675</a><br>
&gt;&gt;<br>
&gt;&gt; We will send more information later: agenda, etherpad for minutes,=
 etc.<br>
&gt;&gt;<br>
&gt;&gt; Let us know if you desire to discuss about additional topics or ot=
her dates fits better for you (note that the interim meeting have to be ann=
ounced two weeks in advance [1])<br>
&gt;&gt;<br>
&gt;&gt; Thank you,<br>
&gt;&gt;<br>
&gt;&gt; Ines, Peter and Michael<br>
&gt;&gt;<br>
&gt;&gt; [1] <a href=3D"https://www.ietf.org/how/meetings/interim/" rel=3D"=
noreferrer" target=3D"_blank">https://www.ietf.org/how/meetings/interim/</a=
><br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt; _______________________________________________<br>
&gt; Roll mailing list<br>
&gt; <a href=3D"mailto:Roll@ietf.org" target=3D"_blank">Roll@ietf.org</a><b=
r>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/roll" rel=3D"noreferr=
er" target=3D"_blank">https://www.ietf.org/mailman/listinfo/roll</a><br>
<br>
_______________________________________________<br>
Roll mailing list<br>
<a href=3D"mailto:Roll@ietf.org" target=3D"_blank">Roll@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/roll" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/roll</a><br>
</blockquote></div>

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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Sun, 8 Sep 2019 10:31:11 +0300
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To: roll <roll@ietf.org>
Cc: peter van der Stok <consultancy@vanderstok.org>, Michael Richardson <mcr+ietf@sandelman.ca>,  Alvaro Retana <aretana.ietf@gmail.com>
Content-Type: multipart/alternative; boundary="0000000000007a224b059205a8bb"
Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/15i741UkT3n7dz6dBkGTsvQb7jY>
Subject: [Roll] ROLL Interim Meeting - 23 September
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--0000000000007a224b059205a8bb
Content-Type: text/plain; charset="UTF-8"

Dear all,

The poll is closed, the selected date/time is:

Date: 23 September2019

Time: 13:00 - 15:00 UTC.

Webex Information to join:
-----------------------------------------------------------------------------------------
ROLL Interim Meeting - 23 Sept 2019
Hosted by ROLL WG

Monday, Sep 23, 2019 9:00 am | 2 hours | (UTC-05:00) Eastern Time (US &
Canada)
Meeting number: 649 726 882
Password: 44TgnsSv
https://ietf.webex.com/ietf/j.php?MTID=m597b185680335e4ca5f03c3a78ae662f

Join by phone
1-650-479-3208 Call-in toll number (US/Canada)
Access code: 649 726 882

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

Etherpad:
https://etherpad.tools.ietf.org/p/roll-interim-virtualmeeting-20190923

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

Agenda/Materials:  https://github.com/roll-wg/ROLL-Interim-Meeting

Thank you and best regards,

Ines and Peter

On Tue, Sep 3, 2019 at 9:33 AM Ines Robles <mariainesrobles@googlemail.com>
wrote:

> Dear all,
>
> We will host a ROLL Interim Meeting to discuss about capabilities and
> status of NPDAO.
>
> Please fill the doodle by this Friday 6th September.
>
> https://doodle.com/poll/d3afe32xra2pg675
>
> We will send more information later: agenda, etherpad for minutes, etc.
>
> Let us know if you desire to discuss about additional topics or other
> dates fits better for you (note that the interim meeting have to be
> announced two weeks in advance [1])
>
> Thank you,
>
> Ines, Peter and Michael
>
> [1] https://www.ietf.org/how/meetings/interim/
>
>
>

--0000000000007a224b059205a8bb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr">Dear all,<br><div><br></div><div>The poll=
 is closed, the selected date/time is:</div><div><br></div><div>Date: 23 Se=
ptember2019</div><div><br></div><div>Time: 13:00 - 15:00 UTC.</div><div><br=
></div><div>Webex Information to join:=C2=A0</div><div>--------------------=
---------------------------------------------------------------------</div>=
<div>ROLL Interim Meeting - 23 Sept 2019</div>Hosted by ROLL WG<br><br>Mond=
ay, Sep 23, 2019 9:00 am | 2 hours | (UTC-05:00) Eastern Time (US &amp; Can=
ada)<br>Meeting number: 649 726 882<br>Password: 44TgnsSv<br><a href=3D"htt=
ps://ietf.webex.com/ietf/j.php?MTID=3Dm597b185680335e4ca5f03c3a78ae662f">ht=
tps://ietf.webex.com/ietf/j.php?MTID=3Dm597b185680335e4ca5f03c3a78ae662f</a=
><br><br>Join by phone<br>1-650-479-3208 Call-in toll number (US/Canada)<br=
>Access code: 649 726 882</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">=
---------------------------------------------------------------------------=
----------------------------<br><div><br></div><div>Etherpad:=C2=A0<a href=
=3D"https://etherpad.tools.ietf.org/p/roll-interim-virtualmeeting-20190923"=
>https://etherpad.tools.ietf.org/p/roll-interim-virtualmeeting-20190923</a>=
</div><div><br></div><div>-------------------------------------------------=
--------------------------------------------------------</div><div><br></di=
v><div>Agenda/Materials:=C2=A0=C2=A0<a href=3D"https://github.com/roll-wg/R=
OLL-Interim-Meeting">https://github.com/roll-wg/ROLL-Interim-Meeting</a>=C2=
=A0</div><div><br></div><div>Thank you and best regards,<br></div><div><br>=
</div><div>Ines and Peter</div></div><br><div class=3D"gmail_quote"><div di=
r=3D"ltr" class=3D"gmail_attr">On Tue, Sep 3, 2019 at 9:33 AM Ines  Robles =
&lt;<a href=3D"mailto:mariainesrobles@googlemail.com">mariainesrobles@googl=
email.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><div dir=3D"ltr">Dear all,<br><div><br></div><div>We will host a=
 ROLL Interim Meeting to discuss about capabilities and status of NPDAO.</d=
iv><div><br></div><div>Please fill the doodle by this Friday 6th September.=
</div><div><br></div><div><a href=3D"https://doodle.com/poll/d3afe32xra2pg6=
75" target=3D"_blank">https://doodle.com/poll/d3afe32xra2pg675</a><br></div=
><div><br></div><div>We will send more information later: agenda, etherpad =
for minutes, etc.</div><div><br></div><div>Let us know if you desire to dis=
cuss about additional topics or other dates fits better for you (note that =
the interim meeting have to be announced two weeks in advance [1])</div><di=
v><br></div><div>Thank you,</div><div><br></div><div>Ines, Peter and Michae=
l</div><div><br></div><div>[1]=C2=A0<a href=3D"https://www.ietf.org/how/mee=
tings/interim/" target=3D"_blank">https://www.ietf.org/how/meetings/interim=
/</a></div><div><br></div><div><br></div></div>
</blockquote></div></div>

--0000000000007a224b059205a8bb--


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

Please see below


pascal>   *   Signal supported OFs
pascal>   *   Express support for RFC 8138 (needed for draft-thubert-roll-t=
urnon-rfc8138 as well)

mcr> It seems like these are capabilities separate from P-DAO itself.
mcr> That these are things that could be enabled or not even without P-DAO.
mcr> That P-DAO could run without them.  Is that correct, or is there a dep=
endancy that I'm ignorant of?

The need for turnon predates P-DAO. But still, knowing whether to encapsula=
te to the parent depends on whether 8138 is used. The RUL could ignore RPL =
artifacts as a good RFC 8200 soldier, but it may not disgest the compressio=
n as easily. This is why I wish to ship MOP ext and turnon quickly, they ar=
e part of the foundation.

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

pascal>   *   Express support for exposing siblings

mcr>  guess I need to read P-DAO again to understand why this isn't part of=
 P-DAO.

I want to put in in P-DAO now. I'm asking the OK since that was not origina=
lly there.

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

pascal>   *   Express support for storing P-DAO
pascal>   *   Express the capacity in terms of routes {
pascal>      *   approximate Nb of routes that can be installed,
pascal>      *   Current % route storage used,
pascal>      *   Target % route storage used - if target < current then Roo=
t should move some paths
pascal>      *   overload bit that means do not use me for now }

mcr>  Clearly if you say you support P-DAO, then you also need to say how m=
any routes you can support.  In non-storing mode, the node would store zero=
 routes, so the root would always know how many routes there are, and does =
not need to know % and target, does it?

I mean not storing P-DAO. This installs a route in the tunnel ingress somew=
here in the network. Nodes along the path would be transparent as long as t=
hey support RFC 6550 non storing mode and do not expect the root to be the =
encapsulator, why would they, but hey, that could be a slightly different c=
ode path. Note that we want to enable any form of P-DAO on any RPL mode, ap=
art from MOP 0 (collection MP2P).

mcr>  In storing mode, it seems that the root won't learn how much space th=
ere is at each level from the DAOs, just how many routes are used in each d=
irectly children, so we do need to know how many are used and how much spac=
e there is.

Yes, the root manages a space in the device

mcr>  Clearly, how many are used, and the overload bit are things that need=
 to updated regularly, while the total capacity is updated once.

mcr>  I suggest therefore that what we need to do is to inform the root on =
a periodic basis how many available slots there are.  This would seem to ca=
pture all of the data you indicate into a single number?

WFM. I agree we need to make that efficient. E.g., the collection of the da=
ta could be aggregated as it goes up.

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

pascal>   *   Same for non-storing P-DAO using an average number of hops pe=
r route, e.g., 5.
pascal>      *   Plus: Maximum nb hops in a route

mcr>   Your thought is that a node will have X many slots for "hops", and t=
hat a route would consist of a some number of hops, so that it's not destin=
ations that we need to account for, but rather hops?

Yes, we need to express how mush resources a SRH state costs in the tunnel =
ingress, and that seems to be a linear function of the number of hops. If b=
 is the cost of a storing mode P-DAO state, and a in the incremental cost p=
er hop in SRH, then with x hops the cost would be ax+b.

mcr>   I feel that the amount of active space does not really fit into capa=
bilities as I had originally imagined.  That capabilities are something tha=
t are communicated once after the node joins a particular DODAG. While avai=
lable slots for hops is something that requires more frequent updates and s=
hould use a different mechanism. But perhaps I'm thinking too much about th=
is, and that one mechanism can do both.

I agree. It could be a similar transport with options. Like the root pulls =
something and all report that something. Or a node asynchronously update. I=
 think the NIQ/NAO mechanism would have very different properties than the =
DIO/DAO.

All the best

Pascal=20

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


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Subject: [Roll] I-D Action: draft-ietf-roll-unaware-leaves-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Routing Over Low power and Lossy networks WG of the IETF.

        Title           : Routing for RPL Leaves
        Authors         : Pascal Thubert
                          Michael C. Richardson
	Filename        : draft-ietf-roll-unaware-leaves-04.txt
	Pages           : 30
	Date            : 2019-09-09

Abstract:
   This specification extends RFC6550 and RFC8505 to provide unicast and
   multicast routing services in a RPL domain to 6LNs that are plain
   hosts and do not participate to RPL.


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

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

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


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

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


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Subject: [Roll] Routing Over Low power and Lossy networks (roll) WG Virtual Meeting: 2019-09-23
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The Routing Over Low power and Lossy networks (roll) Working Group will hold
a virtual interim meeting on 2019-09-23 from 13:00 to 15:00 UTC.

Agenda:
Draft Agenda:

- Disscuss about: draft-ietf-roll-mopex-cap-00 Mode of Operation extension and Capabilities
- NPDAO modifications.



Information about remote participation:
ROLL Interim Meeting - 23 Sept 2019 
Hosted by ROLL WG  
Monday, Sep 23, 2019 9:00 am | 2 hours | (UTC-05:00) Eastern Time (US & Canada) 
Meeting number: 649 726 882 
Password: 44TgnsSv 
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Join by phone 1-650-479-3208 Call-in toll number (US/Canada) 
Access code: 649 726 882

https://etherpad.tools.ietf.org/p/roll-interim-virtualmeeting-20190923


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Subject: [Roll] FW:  I-D Action: draft-ietf-roll-unaware-leaves-04.txt
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Dear all;

This version syncs with the work in progress on external routes in useofrpl=
info, which we extracted from the RFC editor Q.
The proposed change is contained in one new section 4.1 and the proposed op=
eration is as follows=20
(candidate change for useofRPLinfo):

"

4.1.  Updates to RFC6550: Advertise External Routes with Non-Storing
      Mode Signaling.

   Section 6.7.8. of [RFC6550] introduces the 'E' flag that is set to
   indicate that the 6LR that generates the DAO redistributes external
   targets into the RPL network.  An external Target is a Target that
   has been learned through an alternate protocol, for instance an route
   to a prefix that is outside the RPL domain but reachable via a 6LR.
   Being outside of the RPL domain, a node that is reached via an
   external target cannot be guaranteed to ignore the RPL artifacts and
   cannot be expected to process the [RFC8138] compression correctly.
   This means that the RPL artifacts and the compression should be
   contained in an IP-in-IP encapsulation that is removed by the 6LR.

   This specification updates RPL [RFC6550] to RECOMMEND that external
   targets are advertised using Non-Storing Mode signaling even in a
   Storing-Mode network.  This way, all packets to an external target
   reach the Root that can encapsulate them, and the Root is informed of
   the address of the 6LR that terminates the IP-in-IP tunnel.  In case
   of an external target, the Root SHOULD use the same IP-in-IP
   encapsulation for packets that it generates or that are originated
   within the RPL domain as if the packets were coming from the
   Internet.

   A RUL is a special case of external target when the target is
   actually a host and it is known to support a consumed Routing Header
   and to ignore a HbH header as prescribed by [RFC8200].  The target
   may have been learned through as a host route or may have been
   registered to the 6LR using [RFC8505].  IP-in-IP encapsulation MAY be
   avoided for Root to RUL communication if the RUL is known to process
   the packets as forwarded by the parent 6LR without decapsulation.

   In order to enable IP-in-IP all the way to a 6LN, it is beneficial
   that the 6LN supports decapsulating IP-in-IP, but that is not assumed
   by [RFC8504].  If the 6LN is a RUL, the Root that encapsulates a
   packet SHOULD terminate the tunnel at a parent 6LR unless it is aware
   that the RUL supports IP-in-IP decapsulation.

   A node that is reachable over an external route is not expected to
   support [RFC8138].  Whether a decapsulation took place or not and
   even when the 6LR is delivering the packet to a RUL, the 6LR that
   injected the external route MUST uncompress the packet before
   forwarding over that external route.

"

Comments welcome;

Pascal






-----Original Message-----
From: Roll <roll-bounces@ietf.org> On Behalf Of internet-drafts@ietf.org
Sent: lundi 9 septembre 2019 15:24
To: i-d-announce@ietf.org
Cc: roll@ietf.org
Subject: [Roll] I-D Action: draft-ietf-roll-unaware-leaves-04.txt


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

        Title           : Routing for RPL Leaves
        Authors         : Pascal Thubert
                          Michael C. Richardson
	Filename        : draft-ietf-roll-unaware-leaves-04.txt
	Pages           : 30
	Date            : 2019-09-09

Abstract:
   This specification extends RFC6550 and RFC8505 to provide unicast and
   multicast routing services in a RPL domain to 6LNs that are plain
   hosts and do not participate to RPL.


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

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

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-roll-unaware-leaves-04


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

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

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


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--=-=-=
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Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    > RPL says

    >      1-127: Not an outright rejection; the node sending the DAO-ACK is
    > willing to act as a parent, but the receiving node is suggested to fi=
nd
    > and use an alternate parent instead.  127-255: Rejection; the node
    > sending the DAO-ACK is unwilling to act as a parent.


    > Note that the 127 as a rejection is a typo. The intent was that 127 is
    > not a rejection. We could write an erratum for this I guess so
    > rejection starts at 128.

Yes, that really needs to be an erratum.




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




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--=-=-=
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Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    >      1-127: Not an outright rejection; the node sending the DAO-ACK is
    > willing to act as a parent, but the receiving node is suggested to fi=
nd
    > and use an alternate parent instead.  127-255: Rejection; the node
    > sending the DAO-ACK is unwilling to act as a parent.


    > Note that the 127 as a rejection is a typo. The intent was that 127 is
    > not a rejection. We could write an erratum for this I guess so
    > rejection starts at 128.

https://www.rfc-editor.org/errata/eid3287


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




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Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    > To generate rfcdiff https://tools.ietf.org/rfcdiff please use:
    > draft-ietf-roll-efficient-npdao vs.
    > https://raw.githubusercontent.com/pthubert/efficient-route-invalidati=
on/master/draft-ietf-roll-efficient-npdao.txt

I read the changes, and I agree.

=2D-=20
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 -=3D IPv6 IoT consulting =3D-




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Comments: In-reply-to "Pascal Thubert (pthubert)" <pthubert@cisco.com> message dated "Mon, 09 Sep 2019 10:48:28 -0000."
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Subject: [Roll] unware leaves --- terminology and expectations
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Some offlist emails among the authors had led me to wonder if I know what I=
'm
talking about.  This was brought about by the potential impact on
useofrplinfo document.=20=20

The RPL unware document has the following definitions.

   The term RPL-Unaware Leaf (RUL) is used to refer to a node that uses
   a RPL router (without necessarily knowing it) as 6LR and depends on
   that router to obtain reachability for its addresses inside the RPL
   domain.  On the contrary, the term RPL-Aware Node (RAN) is used to
   refer to a RAL or a RPL router that participates to RPL and
   advertises its addresses of prefixes by itself.

   Other terms in use in LLNs are found in Terminology for Constrained-
   Node Networks [RFC7228].

So we have two categories of nodes:
   1) RUL --- aka classic host
   2) RAN --- modern host, or 6LR

The sentence:
   the term RPL-Aware Node (RAN) is used to
   refer to a RAL or a RPL router that participates to RPL and
   advertises its addresses of prefixes by itself.

is perhaps imprecise for me.  Does a RAL
   "participates to RPL and
   advertises its addresses of prefixes by itself"

I think the answer is mostly no. It doesn't speak RPL. It is aware
that it's among RPL, it just doesn't speak it.  It uses ND with EARO with
TIDs.  I think that what I'm saying should be unsurprising.

I'm just saying this again, because I'm not sure everyone is on the same pa=
ge=20
here.=20

It occurs to me that our document has the wrong title, and
that the filename is also slightly misleading.  It's that want
make a class of unaware leaves, it's that we want leaves that are
unware of RPL control plane messages, but are aware of PRL data
plane messages.

Section 6 says:

   This document provides RPL routing for a 6LN acting as a plain host
   and not aware of RPL.  Still, a minimal RPL-independent functionality
   is expected from the 6LN in order to operate properly as a RLU; in
   particular:

it looks like "RLU" is a typo for "RUL", but really, shouldn't it be speaki=
ng
about RALs?

I think that we are creating a new class of leaf, the *RAL*, with a "pure"
RFC8505 host that speaks only 6lowpan being the RUL.

Do you agree?

Pascal has written some text to update useofrplinfo, and it wasn't what I
imagined.  It updates in a different place.  We have basically three choice=
s:

1) publish useofrplinfo more or less as-is.  It explains how to deal with
   having RULs in the LLN in sufficient detail such that hopefully nobody
   will want to do that.
   Unaware leaves would then Updates useofrplinfo, obsoleting the sections
   that deal with RULs.
=20=20=20
2) we could decide that having RULs in the LLN is dumb, and one should only
   have RALs, and that removes ~6, possibly 8 cases from useofrplinfo.
   We'd just delete text, which is way easier than writing new text.
=20=20=20
3) we could significantly change useofrplinfo, explaining what supporting R=
ULs would
   mean, then recommending against supporting them in LLNs.

which is best depends upon what kind of "installed base" of devices in the
production queue we think there is.   I prefer (1) or (2) above.

This is a major part of the discussion I want to have at the virtual interi=
m.

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

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

The RUL draft:
- specifies how a RUL uses RFC 8505 without the need to understand anything=
 about RPL
- does not care about RALs
- defines the operations that can be done by a RPL router to provide connec=
tivity to a RUL.


To be a good citizen of the RUL draft, a RUL must support:

from  	RFC 8200		RFC 8505	RFC 6550 =09

	Consumed   SRH	FULL		Nothing=09
        	Ignore HbH              =09


My current definitions:

- a RPL leaf is a 6LN that is attached to a RPL router, and reachable acros=
s a RPL network, though it may or may not know about it. A leaf must not sh=
ow as a RPL router to other RPL nodes. A node that understands the RPL prot=
ocol but cannot do critical aspects of the configuration, e.g., it doesn't =
support the MOP or does not know the RPLinstanceID, can only attach as a le=
af.

- a RUL is a RPL leaf that does not support anything from RFC 6550. It does=
 not process ICMPv6 of type 155 (RPL Control Message) in any fashion, as op=
posed to a RAN that supports that ICMP. This is what I mean with the term a=
wareness. A RUL may be configured with a RPLInstanceID but that's an U-8 op=
aque, it has no clue what that opaque represents, just like a given layer d=
oes not understand information that belongs to another layer but can transp=
ort it opaquely.

- a RAL is a RAN that is also a leaf, so it cannot show as a router. It doe=
s not send DIOs but to poison (infinite Rank). It sends unicast and multica=
st DAOs to advertise its ULA and GUA address(es). It receives DIOs and mult=
icast DAOs because these are for link local use.


What is not so clear is whether the expectations that the RUL draft has on =
RULs are part of the definition of being a RUL or if these are things that =
a RUL must do on top of being a RUL to be compatible with the RUL draft. In=
 the former acceptation it would mean that the RUL draft defines the concep=
t of RUL. If it does then the useofrplinfo draft must have a normative ref =
on the RUL draft. In the latter acceptation it means that the support of th=
e RUL draft must be on the box of the RUL device as one of the things it ca=
n do on top of being a 6LN. I wrote the text with the latter in mind so we =
could ship useofrplinfo with no reference on RUL. Now, if we agree to defer=
 useofrplinfo to make a normative ref of the RUL draft, then the expectatio=
ns in the table above can be made part of the definition of being a RUL. A =
RUL would become by definition a node that supports and does everything the=
 RUL draft says it should. That would make life a lot easier.

More below:


-----Original Message-----
From: Roll <roll-bounces@ietf.org> On Behalf Of Michael Richardson
Sent: jeudi 12 septembre 2019 20:57
To: roll@ietf.org
Subject: [Roll] unware leaves --- terminology and expectations


Some offlist emails among the authors had led me to wonder if I know what I=
'm talking about.  This was brought about by the potential impact on useofr=
plinfo document. =20

The RPL unware document has the following definitions.

   The term RPL-Unaware Leaf (RUL) is used to refer to a node that uses
   a RPL router (without necessarily knowing it) as 6LR and depends on
   that router to obtain reachability for its addresses inside the RPL
   domain.  On the contrary, the term RPL-Aware Node (RAN) is used to
   refer to a RAL or a RPL router that participates to RPL and
   advertises its addresses of prefixes by itself.

   Other terms in use in LLNs are found in Terminology for Constrained-
   Node Networks [RFC7228].

So we have two categories of nodes:
   1) RUL --- aka classic host
   2) RAN --- modern host, or 6LR

<pt> not really, the R means it is connected to a RPL network so a 6LN beco=
mes a Rxx when deployed in a RPL network. And the A vs. U is about speaking=
 RFC 6550. A RAL limits what it does with RPL to non-routing operations. </=
pt>

The sentence:
   the term RPL-Aware Node (RAN) is used to
   refer to a RAL or a RPL router that participates to RPL and
   advertises its addresses of prefixes by itself.

is perhaps imprecise for me.  Does a RAL
   "participates to RPL and
   advertises its addresses of prefixes by itself"

<pt> yes in my book </pt>



I think the answer is mostly no. It doesn't speak RPL. It is aware that it'=
s among RPL, it just doesn't speak it.  It uses ND with EARO with TIDs.  I =
think that what I'm saying should be unsurprising.

<pt> I guess there's not right and wrong. It a matter of defining the words=
 we use, a good thing to do early in any process. Changing the definitions =
I used for so far for the RUL draft may have heavy implication at this stag=
e </pt>


I'm just saying this again, because I'm not sure everyone is on the same pa=
ge here.=20

It occurs to me that our document has the wrong title, and that the filenam=
e is also slightly misleading.  It's that want make a class of unaware leav=
es, it's that we want leaves that are unware of RPL control plane messages,=
 but are aware of PRL data plane messages.

Section 6 says:

   This document provides RPL routing for a 6LN acting as a plain host
   and not aware of RPL.  Still, a minimal RPL-independent functionality
   is expected from the 6LN in order to operate properly as a RLU; in
   particular:

it looks like "RLU" is a typo for "RUL", but really, shouldn't it be speaki=
ng about RALs?

<pt> This was fixed in https://tools.ietf.org/html/draft-ietf-roll-unaware-=
leaves-04 </pt>


I think that we are creating a new class of leaf, the *RAL*, with a "pure"
RFC8505 host that speaks only 6lowpan being the RUL.

Do you agree?

<pt>=20
Not per the above. I think we have the same categories in mind but the name=
s are shifted by one. The thing that does not speak RFC 8505 for me is a pl=
ain host. A plain host leaf is reachable when RPL advertises prefix routes.=
 This is part of the more general external route, when you redistribute som=
ething into RPL. For those we need to encaps to the parent 6LR; this is the=
 core of my changes in useofrplinfo, because that case was missing. At some=
 point I thought that we could do that for also for RULs, and then I reread=
 useofrplinfo and thought gain. Useofrplinfo is correct that there are many=
 cases when we do not need to encap to the 6LR, so let's preserve useofrpli=
nfo as is and keep the benefit of all the review process.
</pt>

Pascal has written some text to update useofrplinfo, and it wasn't what I i=
magined.  It updates in a different place.  We have basically three choices=
:

1) publish useofrplinfo more or less as-is.  It explains how to deal with
   having RULs in the LLN in sufficient detail such that hopefully nobody
   will want to do that.
   Unaware leaves would then Updates useofrplinfo, obsoleting the sections
   that deal with RULs.

<pt> Argl, no; we took useofrplinfo off the RFC editor queue.Let's do what =
makes it correct when RUM ships </pt>
  =20
2) we could decide that having RULs in the LLN is dumb, and one should only
   have RALs, and that removes ~6, possibly 8 cases from useofrplinfo.
   We'd just delete text, which is way easier than writing new text.
  =20
<pt> the difference you're talking about is about encapsulating to the 6LR,=
 correct? The cases are that packets internet to RUL are encapsulated where=
as packets sourced at the root are not. If you look at it that has to do wi=
th RFC 8200 not RFC 8505. If we pick the definition of RUL as being the thi=
ng that supports all the RUL draft then RFC 8200 is in there, and the root =
to RUL stays the same. I agree that implementing a node that does RFC 8505 =
as per the RUL draft and does not support the basics of a host per RFC 8200=
 is not worth considering. </pt>

3) we could significantly change useofrplinfo, explaining what supporting R=
ULs would
   mean, then recommending against supporting them in LLNs.

<pt> I do not see the need to do that. The text of root to RUL in usefrplin=
fo is compatible with rul-04, at least I made every effort in that directio=
n.
</pt>

which is best depends upon what kind of "installed base" of devices in the
production queue we think there is.   I prefer (1) or (2) above.


<pt>I favor inserting the snippet I have for routes that are external (expe=
ct to well behaved RULs) which tunnel to the parent 6LR. For well behaved R=
ULs the text would stand as is.=20

Please let me know what I missed?

About the interim: I'd like to agree on the RUL definition, whether we dela=
y shipping useofrplinfo off the RPL editor queue because it has a normative=
 reference on RUL. I think we should.
</pt>


All the best

Pascal


From nobody Fri Sep 13 11:58:00 2019
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] unware leaves --- terminology and expectations
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Subject: Re: [Roll] unware leaves --- terminology and expectations
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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Sat, 14 Sep 2019 12:07:37 +0300
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To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: peter van der Stok <consultancy@vanderstok.org>, roll <roll@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/oEGzvGEutEI5hoBeBn9hNjXNrEk>
Subject: Re: [Roll] WG adoption call for draft-richardson-6tisch-roll-enrollment-priority-02 - Extended
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Hi  Michael,

The document presents support from the WG. Please update
draft-richardson-6tisch-roll-enrollment-priority-02  as ietf WG draft.

Thank you very much for your hard work.

Ines and Peter.

On Tue, Aug 27, 2019 at 10:37 AM Ines Robles <mariainesrobles@googlemail.com>
wrote:

> Dear all,
>
> We extend this WG adoption call until 10 September.
>
> It would be nice to have your opinion on this.
>
> Thank you very much in advance,
>
> Ines and Peter.
>
> On Thu, Aug 8, 2019 at 4:19 PM Ines Robles <mariainesrobles@googlemail.com>
> wrote:
>
>> Dear all,
>>
>> This is a call for WG adoption of the
>> draft draft-richardson-6tisch-roll-enrollment-priority-02.
>>
>> The call starts today 08-08-2019 until 08-22-2019.
>>
>> Please let us know your opinion on this.
>>
>> Thank you in advance,
>>
>> Ines and Peter.
>>
>

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<div dir=3D"ltr">Hi=C2=A0 Michael,<br><div><br></div><div>The document pres=
ents support from the WG. Please update=C2=A0<font style=3D"vertical-align:=
inherit"><font style=3D"vertical-align:inherit">draft-richardson-6tisch-</f=
ont></font><font style=3D"vertical-align:inherit"><font style=3D"vertical-a=
lign:inherit">roll-enrollment-priority-02 </font></font>=C2=A0as ietf WG dr=
aft.</div><div><br></div><div>Thank you very much for your hard work.</div>=
<div><br></div><div>Ines and Peter.</div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Aug 27, 2019 at 10:37 AM I=
nes  Robles &lt;<a href=3D"mailto:mariainesrobles@googlemail.com">mariaines=
robles@googlemail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,20=
4);padding-left:1ex"><div dir=3D"ltr"><div dir=3D"ltr">Dear all,<br><div><b=
r></div><div>We extend this WG adoption call until 10 September.=C2=A0</div=
><div><br></div><div>It would be nice to have your opinion on this.</div><d=
iv><br></div><div>Thank you very much in advance,</div><div><br></div><div>=
Ines and Peter.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Thu, Aug 8, 2019 at 4:19 PM Ines  Robles &lt;<a hre=
f=3D"mailto:mariainesrobles@googlemail.com" target=3D"_blank">mariainesrobl=
es@googlemail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);p=
adding-left:1ex"><div dir=3D"ltr">Dear all,<div><br></div><div>This is a ca=
ll for WG adoption of the draft=C2=A0draft-richardson-6tisch-roll-enrollmen=
t-priority-02.</div><div><br></div><div>The call starts today 08-08-2019 un=
til 08-22-2019.</div><div><br></div><div>Please let us know your opinion on=
 this.</div><div><br></div><div>Thank you in advance,</div><div><br></div><=
div>Ines and Peter.</div></div>
</blockquote></div></div>
</blockquote></div>

--0000000000007a475705927fb41b--


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Subject: [Roll] 2019 IEEE Vehicular Networking Conference (VNC): Submission Deadlines Extended by One Week
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Dear Colleagues,

Please accept our apologies if you receive multiple copies of this CFP. The
paper submission deadlines of the 2019 IEEE Vehicular Networking Conference
(VNC=E2=80=9919) have been extended by one week. Please find enclosed below=
 an
updated Call for Paper with the revised deadlines.

Thanks and regards,
VNC=E2=80=9919 Organizing Committee


---------------------------------------------------------------------------=
----------------
CALL FOR PAPERS
2019 IEEE Vehicular Networking Conference (VNC)
December 4-6, 2019
Los Angeles, California
http://www.ieee-vnc.org/cfp.html

All submitted papers will be peer-reviewed. A Best Paper Award will be
given to a high-impact paper selected by a committee. Accepted papers will
appear in the conference proceedings and will be archived in the IEEE
Xplore Digital Library.

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

The 2019 IEEE Vehicular Networking Conference (VNC) seeks to bring together
researchers, professionals, and practitioners to present and discuss recent
developments and challenges in vehicular networking technologies, and their
applications. Topics of interest include, but are not limited to:

   - 5G technologies for connected vehicles
   - Innovative vehicular network applications (e.g., those in
   transportation safety, efficiency, and comfort as well as electrical
   vehicle and power grid integration) and their communication requirements
   - Communications and networking for automated and semi-automated
   vehicles (e.g., collective perception, sensor data sharing, cooperative
   driving, cooperative maneuvering, cooperative intersections and highways=
,
   platooning)
   - Field measurements and/or real-world deployments of vehicular networks
   and applications
   - Impact assessments of vehicular networks on transportation (e.g.,
   safety, efficiency, comfort, environmental sustainability)
   - Modeling, design, as well as theoretical and empirical analysis of
   vehicular networks and applications
   - Hardware and software platforms for the simulation, emulation,
   prototyping, measurement, and/or real-world deployment of vehicular
   networks and applications
   - Emerging V2X communication and networking technologies such as
   cellular V2X (C-V2X), dynamic spectrum sharing, mmWave, massive MIMO,
   beamforming, and vehicular visible light communications (VLC)
   - In-vehicle communication and networking systems (e.g., TSN, FlexRay,
   TT-CAN, and mmWave)
   - Vehicular networking architectures and system design
   - Novel physical layer communication technologies for vehicular networks
   - Radio propagation aspects of vehicular networks (e.g., channel
   measurements, propagation models, antenna design)
   - Vehicular MAC and link layer protocols (e.g., those for URLLC)
   - Vehicular network layer protocols (e.g., real-time information
   dissemination)
   - Transport control and middleware for vehicular network systems (e.g.,
   congestion control, real-time messaging)
   - Heterogeneous vehicular networking (e.g., multi-radio, multi-channel,
   multi-application, multi-technology)
   - Network and QoS management for vehicular networks
   - Security, privacy, liability, and dependability of vehicular networks
   - Communications related to electric and hybrid vehicles
   - Integration of V2C with on-board systems and networks
   - Edge computing for vehicular applications
   - Vehicular networks and IoT integration

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

Important Dates
Full/short paper submission deadline:September 15, 2019, 23:59 AOE
(Anywhere on Earth, UTC-12)
Demo/Poster paper Submission Deadline:September 30, 2019, 23:59 AOE
(Anywhere on Earth, UTC-12)
Acceptance notification:October 22, 2019
Camera ready paper due:November 4, 2019
Conference:December 4-6, 2019
------------------------------------------------------------
-------------------------------
Organizing CommitteeGeneral Co-Chairs

Danijela Cabric, UCLA, USA
Onur Altintas, Toyota InfoTech Labs, USA

TPC Co-Chairs

Tim Leinmueller, DENSO International Europe, Germany
Hongwei Zhang, Iowa State University, USA

Poster/Demo and Student Travel Grant Co-Chairs

Ashwin Ashok, Georgia State University, USA
Miguel Sepulcre, Universidad Miguel Hern=C3=A1ndez de Elche, Spain

Panel Chair

Jim Lansford, Qualcomm, USA

Publication Chair

Takamasa Higuchi, Toyota InfoTech Labs, USA

Publicity Co-Chairs

Sinem Coleri Ergen, Koc University, Turkey
Qiao Xiang, Yale University, USA

Web Co-Chairs

Seyhan Ucar, Toyota InfoTech Labs, USA
Enes Krijestorac, UCLA, USA

Local Arrangement Co-Chairs

Benjamin Domae, UCLA, USA
Enes Krijestorac, UCLA, USA

Finance Chair

Bruce Worthman, IEEE
Steering Committee

Onur Altintas, Toyota InfoTech Labs, USA
Wai Chen, China Mobile Research Institute, China
Falko Dressler, University of Paderborn, Germany
Geert Heijenk, University of Twente, The Netherlands
Thomas Luckenbach, FOKUS, Germany
Hyun Seo Oh, ETRI, South Korea
Umit Ozguner, Ohio State University, USA
Tadao Saito, Professor Emeritus, The University of Tokyo, Japan


--=20
Qiao Xiang
Associate Research Scientist,
Department of Computer Science,
Yale University

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>De=
ar Colleagues,</div><div><br></div><div><span id=3D"gmail-docs-internal-gui=
d-32694c25-7fff-1655-6f3d-8e3ac0fb796f"><p dir=3D"ltr" style=3D"line-height=
:1.38;margin-top:0pt;margin-bottom:0pt">Please accept our apologies if you =
receive multiple copies of this CFP. The paper submission deadlines of the =
2019 IEEE Vehicular Networking Conference (VNC=E2=80=9919) have been extend=
ed by one week. Please find enclosed below an updated Call for Paper with t=
he revised deadlines. <br><br>Thanks and regards,<br>VNC=E2=80=9919 Organiz=
ing Committee <br><br><br><span style=3D"color:rgb(34,34,34);font-family:Ar=
ial,Helvetica,sans-serif">-------------------------------------------------=
------------------------------------------</span><br></p></span></div><div>=
CALL FOR PAPERS</div><div>2019 IEEE Vehicular Networking Conference (VNC)</=
div><div>December 4-6, 2019</div><div>Los Angeles, California</div><div><a =
href=3D"http://www.ieee-vnc.org/cfp.html">http://www.ieee-vnc.org/cfp.html<=
/a></div><div><br></div><div>All submitted papers will be peer-reviewed. A =
Best Paper Award will be</div><div>given to a high-impact paper selected by=
 a committee. Accepted papers will</div><div>appear in the conference proce=
edings and will be archived in the IEEE</div><div>Xplore Digital Library.</=
div><div><br></div><div>---------------------------------------------------=
----------------------------------------</div><div><br></div><div>The 2019 =
IEEE Vehicular Networking Conference (VNC) seeks to bring together</div><di=
v>researchers, professionals, and practitioners to present and discuss rece=
nt</div><div>developments and challenges in vehicular networking technologi=
es, and their</div><div>applications. Topics of interest include, but are n=
ot limited to:</div><div><br></div><div>=C2=A0 =C2=A0- 5G technologies for =
connected vehicles</div><div>=C2=A0 =C2=A0- Innovative vehicular network ap=
plications (e.g., those in</div><div>=C2=A0 =C2=A0transportation safety, ef=
ficiency, and comfort as well as electrical</div><div>=C2=A0 =C2=A0vehicle =
and power grid integration) and their communication requirements</div><div>=
=C2=A0 =C2=A0- Communications and networking for automated and semi-automat=
ed</div><div>=C2=A0 =C2=A0vehicles (e.g., collective perception, sensor dat=
a sharing, cooperative</div><div>=C2=A0 =C2=A0driving, cooperative maneuver=
ing, cooperative intersections and highways,</div><div>=C2=A0 =C2=A0platoon=
ing)</div><div>=C2=A0 =C2=A0- Field measurements and/or real-world deployme=
nts of vehicular networks</div><div>=C2=A0 =C2=A0and applications</div><div=
>=C2=A0 =C2=A0- Impact assessments of vehicular networks on transportation =
(e.g.,</div><div>=C2=A0 =C2=A0safety, efficiency, comfort, environmental su=
stainability)</div><div>=C2=A0 =C2=A0- Modeling, design, as well as theoret=
ical and empirical analysis of</div><div>=C2=A0 =C2=A0vehicular networks an=
d applications</div><div>=C2=A0 =C2=A0- Hardware and software platforms for=
 the simulation, emulation,</div><div>=C2=A0 =C2=A0prototyping, measurement=
, and/or real-world deployment of vehicular</div><div>=C2=A0 =C2=A0networks=
 and applications</div><div>=C2=A0 =C2=A0- Emerging V2X communication and n=
etworking technologies such as</div><div>=C2=A0 =C2=A0cellular V2X (C-V2X),=
 dynamic spectrum sharing, mmWave, massive MIMO,</div><div>=C2=A0 =C2=A0bea=
mforming, and vehicular visible light communications (VLC)</div><div>=C2=A0=
 =C2=A0- In-vehicle communication and networking systems (e.g., TSN, FlexRa=
y,</div><div>=C2=A0 =C2=A0TT-CAN, and mmWave)</div><div>=C2=A0 =C2=A0- Vehi=
cular networking architectures and system design</div><div>=C2=A0 =C2=A0- N=
ovel physical layer communication technologies for vehicular networks</div>=
<div>=C2=A0 =C2=A0- Radio propagation aspects of vehicular networks (e.g., =
channel</div><div>=C2=A0 =C2=A0measurements, propagation models, antenna de=
sign)</div><div>=C2=A0 =C2=A0- Vehicular MAC and link layer protocols (e.g.=
, those for URLLC)</div><div>=C2=A0 =C2=A0- Vehicular network layer protoco=
ls (e.g., real-time information</div><div>=C2=A0 =C2=A0dissemination)</div>=
<div>=C2=A0 =C2=A0- Transport control and middleware for vehicular network =
systems (e.g.,</div><div>=C2=A0 =C2=A0congestion control, real-time messagi=
ng)</div><div>=C2=A0 =C2=A0- Heterogeneous vehicular networking (e.g., mult=
i-radio, multi-channel,</div><div>=C2=A0 =C2=A0multi-application, multi-tec=
hnology)</div><div>=C2=A0 =C2=A0- Network and QoS management for vehicular =
networks</div><div>=C2=A0 =C2=A0- Security, privacy, liability, and dependa=
bility of vehicular networks</div><div>=C2=A0 =C2=A0- Communications relate=
d to electric and hybrid vehicles</div><div>=C2=A0 =C2=A0- Integration of V=
2C with on-board systems and networks</div><div>=C2=A0 =C2=A0- Edge computi=
ng for vehicular applications</div><div>=C2=A0 =C2=A0- Vehicular networks a=
nd IoT integration</div><div><br></div><div>-------------------------------=
-----------------------------</div><div>-------------------------------</di=
v><div><br></div><div>Important Dates</div><div>Full/short paper submission=
 deadline:September 15, 2019, 23:59 AOE</div><div>(Anywhere on Earth, UTC-1=
2)</div><div>Demo/Poster paper Submission Deadline:September 30, 2019, 23:5=
9 AOE</div><div>(Anywhere on Earth, UTC-12)</div><div>Acceptance notificati=
on:October 22, 2019</div><div>Camera ready paper due:November 4, 2019</div>=
<div>Conference:December 4-6, 2019</div><div>------------------------------=
------------------------------</div><div>-------------------------------</d=
iv><div>Organizing CommitteeGeneral Co-Chairs</div><div><br></div><div>Dani=
jela Cabric, UCLA, USA</div><div>Onur Altintas, Toyota InfoTech Labs, USA</=
div><div><br></div><div>TPC Co-Chairs</div><div><br></div><div>Tim Leinmuel=
ler, DENSO International Europe, Germany</div><div>Hongwei Zhang, Iowa Stat=
e University, USA</div><div><br></div><div>Poster/Demo and Student Travel G=
rant Co-Chairs</div><div><br></div><div>Ashwin Ashok, Georgia State Univers=
ity, USA</div><div>Miguel Sepulcre, Universidad Miguel Hern=C3=A1ndez de El=
che, Spain</div><div><br></div><div>Panel Chair</div><div><br></div><div>Ji=
m Lansford, Qualcomm, USA</div><div><br></div><div>Publication Chair</div><=
div><br></div><div>Takamasa Higuchi, Toyota InfoTech Labs, USA</div><div><b=
r></div><div>Publicity Co-Chairs</div><div><br></div><div>Sinem Coleri Erge=
n, Koc University, Turkey</div><div>Qiao Xiang, Yale University, USA</div><=
div><br></div><div>Web Co-Chairs</div><div><br></div><div>Seyhan Ucar, Toyo=
ta InfoTech Labs, USA</div><div>Enes Krijestorac, UCLA, USA</div><div><br><=
/div><div>Local Arrangement Co-Chairs</div><div><br></div><div>Benjamin Dom=
ae, UCLA, USA</div><div>Enes Krijestorac, UCLA, USA</div><div><br></div><di=
v>Finance Chair</div><div><br></div><div>Bruce Worthman, IEEE</div><div>Ste=
ering Committee</div><div><br></div><div>Onur Altintas, Toyota InfoTech Lab=
s, USA</div><div>Wai Chen, China Mobile Research Institute, China</div><div=
>Falko Dressler, University of Paderborn, Germany</div><div>Geert Heijenk, =
University of Twente, The Netherlands</div><div>Thomas Luckenbach, FOKUS, G=
ermany</div><div>Hyun Seo Oh, ETRI, South Korea</div><div>Umit Ozguner, Ohi=
o State University, USA</div><div>Tadao Saito, Professor Emeritus, The Univ=
ersity of Tokyo, Japan</div><div><br></div><div><br></div>-- <br><div dir=
=3D"ltr" class=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><=
div><div dir=3D"ltr"><font size=3D"2">Qiao Xiang<br>Associate Research Scie=
ntist,=C2=A0</font></div><div dir=3D"ltr"><font size=3D"2">Department of Co=
mputer Science,</font></div><div dir=3D"ltr"><font size=3D"2">Yale Universi=
ty</font></div></div></div></div></div></div></div></div></div></div>

--00000000000065e0b205928d2b98--


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--0000000000008f8d7705928d481a
Content-Type: text/plain; charset="UTF-8"
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Dear Colleagues,

Please accept our apologies if you receive multiple copies of this CFP. The
paper submission deadlines of the 2019 IEEE Vehicular Networking Conference
(VNC=E2=80=9919) have been extended by one week. Please find enclosed below=
 an
updated Call for Paper with the revised deadlines.

Thanks and regards,
VNC=E2=80=9919 Organizing Committee

---------------------------------------------------------------------------=
----------------
CALL FOR PAPERS
2019 IEEE Vehicular Networking Conference (VNC)
December 4-6, 2019
Los Angeles, California
http://www.ieee-vnc.org/cfp.html

All submitted papers will be peer-reviewed. A Best Paper Award will be
given to a high-impact paper selected by a committee. Accepted papers will
appear in the conference proceedings and will be archived in the IEEE
Xplore Digital Library.

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

The 2019 IEEE Vehicular Networking Conference (VNC) seeks to bring together
researchers, professionals, and practitioners to present and discuss recent
developments and challenges in vehicular networking technologies, and their
applications. Topics of interest include, but are not limited to:

   - 5G technologies for connected vehicles
   - Innovative vehicular network applications (e.g., those in
   transportation safety, efficiency, and comfort as well as electrical
   vehicle and power grid integration) and their communication requirements
   - Communications and networking for automated and semi-automated
   vehicles (e.g., collective perception, sensor data sharing, cooperative
   driving, cooperative maneuvering, cooperative intersections and highways=
,
   platooning)
   - Field measurements and/or real-world deployments of vehicular networks
   and applications
   - Impact assessments of vehicular networks on transportation (e.g.,
   safety, efficiency, comfort, environmental sustainability)
   - Modeling, design, as well as theoretical and empirical analysis of
   vehicular networks and applications
   - Hardware and software platforms for the simulation, emulation,
   prototyping, measurement, and/or real-world deployment of vehicular
   networks and applications
   - Emerging V2X communication and networking technologies such as
   cellular V2X (C-V2X), dynamic spectrum sharing, mmWave, massive MIMO,
   beamforming, and vehicular visible light communications (VLC)
   - In-vehicle communication and networking systems (e.g., TSN, FlexRay,
   TT-CAN, and mmWave)
   - Vehicular networking architectures and system design
   - Novel physical layer communication technologies for vehicular networks
   - Radio propagation aspects of vehicular networks (e.g., channel
   measurements, propagation models, antenna design)
   - Vehicular MAC and link layer protocols (e.g., those for URLLC)
   - Vehicular network layer protocols (e.g., real-time information
   dissemination)
   - Transport control and middleware for vehicular network systems (e.g.,
   congestion control, real-time messaging)
   - Heterogeneous vehicular networking (e.g., multi-radio, multi-channel,
   multi-application, multi-technology)
   - Network and QoS management for vehicular networks
   - Security, privacy, liability, and dependability of vehicular networks
   - Communications related to electric and hybrid vehicles
   - Integration of V2C with on-board systems and networks
   - Edge computing for vehicular applications
   - Vehicular networks and IoT integration

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

Important Dates
Full/short paper submission deadline: September 22, 2019, 23:59 (Anywhere
on Earth, UTC-12) AOE (Extended and Final)
Demo/Poster paper submission deadline: October 7, 2019, 23:59 (Anywhere on
Earth, UTC-12) AOE (Extended and Final)
Acceptance notification: October 22, 2019
Camera ready paper due: November 4, 2019
Conference: December 4-6, 2019

------------------------------------------------------------
-------------------------------
Organizing CommitteeGeneral Co-Chairs

Danijela Cabric, UCLA, USA
Onur Altintas, Toyota InfoTech Labs, USA

TPC Co-Chairs

Tim Leinmueller, DENSO International Europe, Germany
Hongwei Zhang, Iowa State University, USA

Poster/Demo and Student Travel Grant Co-Chairs

Ashwin Ashok, Georgia State University, USA
Miguel Sepulcre, Universidad Miguel Hern=C3=A1ndez de Elche, Spain

Panel Chair

Jim Lansford, Qualcomm, USA

Publication Chair

Takamasa Higuchi, Toyota InfoTech Labs, USA

Publicity Co-Chairs

Sinem Coleri Ergen, Koc University, Turkey
Qiao Xiang, Yale University, USA

Web Co-Chairs

Seyhan Ucar, Toyota InfoTech Labs, USA
Enes Krijestorac, UCLA, USA
Local Arrangement Co-Chairs

Benjamin Domae, UCLA, USA
Enes Krijestorac, UCLA, USA

Finance Chair

Bruce Worthman, IEEE

Steering Committee

Onur Altintas, Toyota InfoTech Labs, USA
Wai Chen, China Mobile Research Institute, China
Falko Dressler, University of Paderborn, Germany
Geert Heijenk, University of Twente, The Netherlands
Thomas Luckenbach, FOKUS, Germany
Hyun Seo Oh, ETRI, South Korea
Umit Ozguner, Ohio State University, USA
Tadao Saito, Professor Emeritus, The University of Tokyo, Japan

--=20
Qiao Xiang
Associate Research Scientist,
Department of Computer Science,
Yale University

--0000000000008f8d7705928d481a
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr">Dear Colleagues,</div><div dir=3D"ltr"><br></div><div dir=3D"ltr"=
>Please accept our apologies if you receive multiple copies of this CFP. Th=
e paper submission deadlines of the 2019 IEEE Vehicular Networking Conferen=
ce (VNC=E2=80=9919) have been extended by one week. Please find enclosed be=
low an updated Call for Paper with the revised deadlines.=C2=A0<br><br>Than=
ks and regards,<br>VNC=E2=80=9919 Organizing Committee=C2=A0<br></div><div =
dir=3D"ltr"><br></div><div dir=3D"ltr">------------------------------------=
-------------------------------------------------------</div><div dir=3D"lt=
r">CALL FOR PAPERS</div><div dir=3D"ltr">2019 IEEE Vehicular Networking Con=
ference (VNC)</div><div dir=3D"ltr">December 4-6, 2019</div><div dir=3D"ltr=
">Los Angeles, California</div><div dir=3D"ltr"><a href=3D"http://www.ieee-=
vnc.org/cfp.html">http://www.ieee-vnc.org/cfp.html</a></div><div dir=3D"ltr=
"><br></div><div dir=3D"ltr">All submitted papers will be peer-reviewed. A =
Best Paper Award will be</div><div dir=3D"ltr">given to a high-impact paper=
 selected by a committee. Accepted papers will</div><div dir=3D"ltr">appear=
 in the conference proceedings and will be archived in the IEEE</div><div d=
ir=3D"ltr">Xplore Digital Library.</div><div dir=3D"ltr"><br></div><div dir=
=3D"ltr">------------------------------------------------------------------=
-------------------------</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">=
The 2019 IEEE Vehicular Networking Conference (VNC) seeks to bring together=
</div><div dir=3D"ltr">researchers, professionals, and practitioners to pre=
sent and discuss recent</div><div dir=3D"ltr">developments and challenges i=
n vehicular networking technologies, and their</div><div dir=3D"ltr">applic=
ations. Topics of interest include, but are not limited to:</div><div dir=
=3D"ltr"><br></div><div dir=3D"ltr">=C2=A0 =C2=A0- 5G technologies for conn=
ected vehicles</div><div dir=3D"ltr">=C2=A0 =C2=A0- Innovative vehicular ne=
twork applications (e.g., those in</div><div dir=3D"ltr">=C2=A0 =C2=A0trans=
portation safety, efficiency, and comfort as well as electrical</div><div d=
ir=3D"ltr">=C2=A0 =C2=A0vehicle and power grid integration) and their commu=
nication requirements</div><div dir=3D"ltr">=C2=A0 =C2=A0- Communications a=
nd networking for automated and semi-automated</div><div dir=3D"ltr">=C2=A0=
 =C2=A0vehicles (e.g., collective perception, sensor data sharing, cooperat=
ive</div><div dir=3D"ltr">=C2=A0 =C2=A0driving, cooperative maneuvering, co=
operative intersections and highways,</div><div dir=3D"ltr">=C2=A0 =C2=A0pl=
atooning)</div><div dir=3D"ltr">=C2=A0 =C2=A0- Field measurements and/or re=
al-world deployments of vehicular networks</div><div dir=3D"ltr">=C2=A0 =C2=
=A0and applications</div><div dir=3D"ltr">=C2=A0 =C2=A0- Impact assessments=
 of vehicular networks on transportation (e.g.,</div><div dir=3D"ltr">=C2=
=A0 =C2=A0safety, efficiency, comfort, environmental sustainability)</div><=
div dir=3D"ltr">=C2=A0 =C2=A0- Modeling, design, as well as theoretical and=
 empirical analysis of</div><div dir=3D"ltr">=C2=A0 =C2=A0vehicular network=
s and applications</div><div dir=3D"ltr">=C2=A0 =C2=A0- Hardware and softwa=
re platforms for the simulation, emulation,</div><div dir=3D"ltr">=C2=A0 =
=C2=A0prototyping, measurement, and/or real-world deployment of vehicular</=
div><div dir=3D"ltr">=C2=A0 =C2=A0networks and applications</div><div dir=
=3D"ltr">=C2=A0 =C2=A0- Emerging V2X communication and networking technolog=
ies such as</div><div dir=3D"ltr">=C2=A0 =C2=A0cellular V2X (C-V2X), dynami=
c spectrum sharing, mmWave, massive MIMO,</div><div dir=3D"ltr">=C2=A0 =C2=
=A0beamforming, and vehicular visible light communications (VLC)</div><div =
dir=3D"ltr">=C2=A0 =C2=A0- In-vehicle communication and networking systems =
(e.g., TSN, FlexRay,</div><div dir=3D"ltr">=C2=A0 =C2=A0TT-CAN, and mmWave)=
</div><div dir=3D"ltr">=C2=A0 =C2=A0- Vehicular networking architectures an=
d system design</div><div dir=3D"ltr">=C2=A0 =C2=A0- Novel physical layer c=
ommunication technologies for vehicular networks</div><div dir=3D"ltr">=C2=
=A0 =C2=A0- Radio propagation aspects of vehicular networks (e.g., channel<=
/div><div dir=3D"ltr">=C2=A0 =C2=A0measurements, propagation models, antenn=
a design)</div><div dir=3D"ltr">=C2=A0 =C2=A0- Vehicular MAC and link layer=
 protocols (e.g., those for URLLC)</div><div dir=3D"ltr">=C2=A0 =C2=A0- Veh=
icular network layer protocols (e.g., real-time information</div><div dir=
=3D"ltr">=C2=A0 =C2=A0dissemination)</div><div dir=3D"ltr">=C2=A0 =C2=A0- T=
ransport control and middleware for vehicular network systems (e.g.,</div><=
div dir=3D"ltr">=C2=A0 =C2=A0congestion control, real-time messaging)</div>=
<div dir=3D"ltr">=C2=A0 =C2=A0- Heterogeneous vehicular networking (e.g., m=
ulti-radio, multi-channel,</div><div dir=3D"ltr">=C2=A0 =C2=A0multi-applica=
tion, multi-technology)</div><div dir=3D"ltr">=C2=A0 =C2=A0- Network and Qo=
S management for vehicular networks</div><div dir=3D"ltr">=C2=A0 =C2=A0- Se=
curity, privacy, liability, and dependability of vehicular networks</div><d=
iv dir=3D"ltr">=C2=A0 =C2=A0- Communications related to electric and hybrid=
 vehicles</div><div dir=3D"ltr">=C2=A0 =C2=A0- Integration of V2C with on-b=
oard systems and networks</div><div dir=3D"ltr">=C2=A0 =C2=A0- Edge computi=
ng for vehicular applications</div><div dir=3D"ltr">=C2=A0 =C2=A0- Vehicula=
r networks and IoT integration</div><div dir=3D"ltr"><br></div><div dir=3D"=
ltr">------------------------------------------------------------</div><div=
 dir=3D"ltr">-------------------------------</div><div dir=3D"ltr"><br></di=
v><div dir=3D"ltr">Important Dates</div><div dir=3D"ltr">Full/short paper s=
ubmission deadline: September 22, 2019, 23:59 (Anywhere on Earth, UTC-12) A=
OE (Extended and Final)</div><div dir=3D"ltr">Demo/Poster paper submission =
deadline: October 7, 2019, 23:59 (Anywhere on Earth, UTC-12) AOE (Extended =
and Final)</div><div dir=3D"ltr">Acceptance notification: October 22, 2019=
=C2=A0</div><div dir=3D"ltr">Camera ready paper due: November 4, 2019</div>=
<div dir=3D"ltr">Conference: December 4-6, 2019</div><div dir=3D"ltr"><br><=
/div><div dir=3D"ltr">-----------------------------------------------------=
-------</div><div dir=3D"ltr">-------------------------------</div><div dir=
=3D"ltr">Organizing CommitteeGeneral Co-Chairs</div><div dir=3D"ltr"><br></=
div><div dir=3D"ltr">Danijela Cabric, UCLA, USA</div><div dir=3D"ltr">Onur =
Altintas, Toyota InfoTech Labs, USA</div><div dir=3D"ltr"><br></div><div di=
r=3D"ltr">TPC Co-Chairs</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Ti=
m Leinmueller, DENSO International Europe, Germany</div><div dir=3D"ltr">Ho=
ngwei Zhang, Iowa State University, USA</div><div dir=3D"ltr"><br></div><di=
v dir=3D"ltr">Poster/Demo and Student Travel Grant Co-Chairs</div><div dir=
=3D"ltr"><br></div><div dir=3D"ltr">Ashwin Ashok, Georgia State University,=
 USA</div><div dir=3D"ltr">Miguel Sepulcre, Universidad Miguel Hern=C3=A1nd=
ez de Elche, Spain</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Panel C=
hair</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Jim Lansford, Qualcom=
m, USA</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Publication Chair</=
div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Takamasa Higuchi, Toyota In=
foTech Labs, USA</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Publicity=
 Co-Chairs</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Sinem Coleri Er=
gen, Koc University, Turkey</div><div dir=3D"ltr">Qiao Xiang, Yale Universi=
ty, USA</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Web Co-Chairs</div=
><div dir=3D"ltr"><br></div><div dir=3D"ltr">Seyhan Ucar, Toyota InfoTech L=
abs, USA</div><div dir=3D"ltr">Enes Krijestorac, UCLA, USA</div><div dir=3D=
"ltr">Local Arrangement Co-Chairs</div><div dir=3D"ltr"><br></div><div dir=
=3D"ltr">Benjamin Domae, UCLA, USA</div><div dir=3D"ltr">Enes Krijestorac, =
UCLA, USA</div><div dir=3D"ltr"><br></div><div dir=3D"ltr">Finance Chair</d=
iv><div dir=3D"ltr"><br></div><div dir=3D"ltr">Bruce Worthman, IEEE</div><d=
iv dir=3D"ltr"><br></div><div dir=3D"ltr">Steering Committee</div><div dir=
=3D"ltr"><br></div><div dir=3D"ltr">Onur Altintas, Toyota InfoTech Labs, US=
A</div><div dir=3D"ltr">Wai Chen, China Mobile Research Institute, China</d=
iv><div dir=3D"ltr">Falko Dressler, University of Paderborn, Germany</div><=
div dir=3D"ltr">Geert Heijenk, University of Twente, The Netherlands</div><=
div dir=3D"ltr">Thomas Luckenbach, FOKUS, Germany</div><div dir=3D"ltr">Hyu=
n Seo Oh, ETRI, South Korea</div><div dir=3D"ltr">Umit Ozguner, Ohio State =
University, USA</div><div dir=3D"ltr">Tadao Saito, Professor Emeritus, The =
University of Tokyo, Japan</div><div dir=3D"ltr"><br></div>-- <br><div dir=
=3D"ltr" class=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><=
div><div dir=3D"ltr"><font size=3D"2">Qiao Xiang<br>Associate Research Scie=
ntist,=C2=A0</font></div><div dir=3D"ltr"><font size=3D"2">Department of Co=
mputer Science,</font></div><div dir=3D"ltr"><font size=3D"2">Yale Universi=
ty</font></div></div></div></div></div></div></div></div></div></div>

--0000000000008f8d7705928d481a--


From nobody Mon Sep 16 09:51:39 2019
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Subject: Re: [Roll] WG adoption call for draft-richardson-6tisch-roll-enrollment-priority-02 - Extended
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--=-=-=
Content-Type: text/plain


Ines  Robles <mariainesrobles@googlemail.com> wrote:
    > The document presents support from the WG. Please update
    > draft-richardson-6tisch-roll-enrollment-priority-02  as ietf WG draft.

    > Thank you very much for your hard work.

Document formatted and posted.

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




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From nobody Mon Sep 16 10:20:43 2019
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--=-=-=
Content-Type: text/plain


Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    > The RUL draft:
    > - specifies how a RUL uses RFC 8505 without the need to understand
    > anything about RPL
    > - does not care about RALs
    > - defines the operations that can be done by a RPL router to provide
    > connectivity to a RUL.

I think that we are trying to accomplish the same thing, but I think that we
are disagreeing about how to name things.

I think that if a device supports RFC8505, and is willing to ignore RPI, RH3
*and* IPIP headers, then it's an RAL, and it's an RFCxxxx that we want to
define what it means to be an RAL.

I think that an RUL implements RFC6775(only), and RFC2460(only).
We have to do things in useofrplinfo involving removing IPIP headers at the
previous 6LR in order to accomodate them.

If we knew that all leafs were RALs, then we would not need to do much
to support them.

** RALs do not speak RPL control plane, but tolerate RPL data plane **

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




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From nobody Mon Sep 16 11:36:19 2019
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] unware leaves --- terminology and expectations
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Subject: Re: [Roll] unware leaves --- terminology and expectations
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From nobody Mon Sep 16 23:47:12 2019
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Subject: [Roll] I-D Action: draft-ietf-roll-enrollment-priority-00.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           : Enabling secure network enrollment in RPL networks
        Author          : Michael Richardson
	Filename        : draft-ietf-roll-enrollment-priority-00.txt
	Pages           : 6
	Date            : 2019-09-16

Abstract:
   [I-D.6tisch-enrollment-enhanced-beacon] defines a method by which a
   potential [I-D.ietf-6tisch-minimal-security] can announce itself as a
   available for new Pledges to Join a network.  The announcement
   includes a priority for join.  This document provides a mechanism by
   which a RPL DODAG root can disable join announcements, or adjust the
   base priority for join operation.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-roll-enrollment-priority-00
https://datatracker.ietf.org/doc/html/draft-ietf-roll-enrollment-priority-00


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

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


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--=-=-=
Content-Type: text/plain


Pascal Thubert (pthubert) <pthubert@cisco.com> wrote:
    > Yes we are trying to accomplish the same thing.
    > Note that the RPL data plane the the RxL supports is just following RFC
    > 8200. That does not mean any RPL awareness. So I really do not see why
    > it would have RPL aware in its name...

Neither RFC8200 nor RFC8504 mandate that a node must be able to handle
IP{dst=me}headers,IP{dst=me}.

If we can't handle that in the leaf, then I think we gain nothing by writing this document.

Further, if an RPL-aware-leaf can insert RPI on outgoing packets, then that
also saves inserting an IPIP header at the first 6LR.

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




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From nobody Fri Sep 20 18:51:03 2019
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Subject: [Roll] I-D Action: draft-ietf-roll-rpl-observations-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           : RPL Observations
        Authors         : Rahul Arvind Jadhav
                          Rabi Narayan Sahoo
                          Yuefeng Wu
	Filename        : draft-ietf-roll-rpl-observations-02.txt
	Pages           : 18
	Date            : 2019-09-20

Abstract:
   This document describes RPL protocol design issues, various
   observations and possible consequences of the design and
   implementation choices.


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

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

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


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From: Rahul Jadhav <nyrahul@outlook.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] I-D Action: draft-ietf-roll-rpl-observations-02.txt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/QsZ_5ANIdUdWIL7F2mqZAL1991A>
Subject: [Roll] Fw:  I-D Action: draft-ietf-roll-rpl-observations-02.txt
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Hello All,

The document is been updated for:

  1.  [issues] reported by Rabi on github. Thanks Rabi for the feedback.
  2.  [new section] Adjacencies probing
  3.  [section update] Capabilities, problem statement
  4.  [new section] Eliding Control Options

We would appreciate any feedback on the document and welcome contributors/c=
o-authors.

Regards,
Rahul


________________________________________
From: Roll <roll-bounces@ietf.org> on behalf of internet-drafts@ietf.org <i=
nternet-drafts@ietf.org>
Sent: Saturday, September 21, 2019 1:51 AM
To: i-d-announce@ietf.org
Cc: roll@ietf.org
Subject: [Roll] I-D Action: draft-ietf-roll-rpl-observations-02.txt

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

        Title           : RPL Observations
        Authors         : Rahul Arvind Jadhav
                          Rabi Narayan Sahoo
                          Yuefeng Wu
        Filename        : draft-ietf-roll-rpl-observations-02.txt
        Pages           : 18
        Date            : 2019-09-20

Abstract:
   This document describes RPL protocol design issues, various
   observations and possible consequences of the design and
   implementation choices.


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

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

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-roll-rpl-observations-02


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

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

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

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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Hello All,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
The document is been updated for:</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<ol>
<li>[issues] reported by Rabi on github. Thanks Rabi for the feedback.</li>=
<li>[new section] Adjacencies probing</li><li>[section update] Capabilities=
, problem statement</li><li>[new section] Eliding Control Options</li></ol>
<div>We would appreciate any feedback on the document and welcome contribut=
ors/co-authors.</div>
<div><br>
</div>
<div>Regards,</div>
<div>Rahul</div>
<div></div>
</div>
<div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div id=3D"appendonsend"></div>
<font size=3D"2"><span style=3D"font-size:11pt;">
<div class=3D"PlainText"><br>
________________________________________<br>
From: Roll &lt;roll-bounces@ietf.org&gt; on behalf of internet-drafts@ietf.=
org &lt;internet-drafts@ietf.org&gt;<br>
Sent: Saturday, September 21, 2019 1:51 AM<br>
To: i-d-announce@ietf.org<br>
Cc: roll@ietf.org<br>
Subject: [Roll] I-D Action: draft-ietf-roll-rpl-observations-02.txt<br>
<br>
A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.<br>
This draft is a work item of the Routing Over Low power and Lossy networks =
WG of the IETF.<br>
<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Title&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : RPL Observations<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Authors&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; : Rahul Arvind Jadhav<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Rabi Narayan Sahoo<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 Yuefeng Wu<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Filename&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; : draft-ietf-roll-rpl-observations-02.txt<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Pages&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 18<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Date&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; : 2019-09-20<br>
<br>
Abstract:<br>
&nbsp;&nbsp; This document describes RPL protocol design issues, various<br=
>
&nbsp;&nbsp; observations and possible consequences of the design and<br>
&nbsp;&nbsp; implementation choices.<br>
<br>
<br>
The IETF datatracker status page for this draft is:<br>
<a href=3D"https://datatracker.ietf.org/doc/draft-ietf-roll-rpl-observation=
s/">https://datatracker.ietf.org/doc/draft-ietf-roll-rpl-observations/</a><=
br>
<br>
There are also htmlized versions available at:<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-roll-rpl-observations-02"=
>https://tools.ietf.org/html/draft-ietf-roll-rpl-observations-02</a><br>
<a href=3D"https://datatracker.ietf.org/doc/html/draft-ietf-roll-rpl-observ=
ations-02">https://datatracker.ietf.org/doc/html/draft-ietf-roll-rpl-observ=
ations-02</a><br>
<br>
A diff from the previous version is available at:<br>
<a href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-roll-rpl-observat=
ions-02">https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-roll-rpl-observatio=
ns-02</a><br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at tools.ietf.org.<br>
<br>
Internet-Drafts are also available by anonymous FTP at:<br>
<a href=3D"ftp://ftp.ietf.org/internet-drafts/">ftp://ftp.ietf.org/internet=
-drafts/</a><br>
<br>
_______________________________________________<br>
Roll mailing list<br>
Roll@ietf.org<br>
<a href=3D"https://www.ietf.org/mailman/listinfo/roll">https://www.ietf.org=
/mailman/listinfo/roll</a><br>
</div>
</span></font></div>
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WHEN: 2019-09-23
	3:00 PM - 5:00 PM Monday, Sep 23 2019 (UTC+01:00) Amsterdam, Berlin, Bern, Rome, Stockholm, Vienna

WHERE:
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Draft Agenda:

0) Agenda Bashing
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2) roll call

3) Disscuss about: draft-ietf-roll-mopex-cap-00 Mode of Operation extension and Capabilities
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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Mon, 23 Sep 2019 18:15:04 +0300
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Subject: [Roll] ROLL Interim Meeting - October
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Dear all,

We will host another ROLL Interim Meeting in October to continue the
discussion from today (
https://etherpad.tools.ietf.org/p/roll-interim-virtualmeeting-20190923)

Please fill the doodle by this Friday 27th September.

https://doodle.com/poll/z458yk8ck3de6ra8

Thank you,

Ines and Peter.

--00000000000016afdc059339e365
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<div dir=3D"ltr">Dear all,<br><br>We will host another ROLL Interim Meeting=
 in October to continue the discussion from today (<a href=3D"https://ether=
pad.tools.ietf.org/p/roll-interim-virtualmeeting-20190923">https://etherpad=
.tools.ietf.org/p/roll-interim-virtualmeeting-20190923</a>)<br><br>Please f=
ill the doodle by this Friday 27th September.<br><br><a href=3D"https://doo=
dle.com/poll/z458yk8ck3de6ra8">https://doodle.com/poll/z458yk8ck3de6ra8</a>=
<div><br>Thank you,<br><br>Ines and Peter.<br><br><br></div></div>

--00000000000016afdc059339e365--


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From: Rahul Jadhav <nyrahul@outlook.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: NSA extn review
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Subject: [Roll] NSA extn review
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Hello, Authors of NSA-extension,

I agreed to review the document in IETF105 and would like to provide my com=
ments.

But before going into details, will it be possible to upload the XML versio=
n of the draft to the datatracker? Unlike other drafts, I do not see the XM=
L form of this draft! Also, it would be much efficient if we sync using Git=
Hub repo (where I can send PR for you to review).

My primary point of discussion would be the way MRHoF is handled in the dra=
ft.
The current text/OF described in the document seems insufficient.
MRHOF makes sense only for metrics that are additive in nature. The CAOFs p=
resented in the document are not additive, and the text simply tries to som=
ehow fit MRHOF in the context.

The draft reserves different OCPs for different Common Ancestor Policies (S=
trict, Medium, Relaxed). I thought that the policies are local in nature an=
d different nodes in the same instance could use different policies. If we =
use different OCPs, then this is not possible. It is impractical to assume =
that certain policies (such as CA Strict policy) can be enforced using OCP.

The promiscuous overhearing assumes different security settings. I read the=
 refed draft in 6tisch and it explains the assumptions, however, I believe =
it is better we explain the security implication of promiscuous overhearing=
 in the security considerations in this draft.

Regards,
Rahul

--_000_BM1PR01MB26128F018BFC1088353F7541A9810BM1PR01MB2612INDP_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Hello, Authors of NSA-extension,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
I agreed to review the document in IETF105 and would like to provide my com=
ments.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
But before going into details, will<span style=3D"color: rgb(0, 0, 0); font=
-family: Calibri, Helvetica, sans-serif; font-size: 12pt;">&nbsp;it be poss=
ible to upload the XML version of the draft to the datatracker? Unlike othe=
r drafts, I do not see the XML form of
 this draft! Also, i</span><span style=3D"color: rgb(0, 0, 0); font-family:=
 Calibri, Helvetica, sans-serif; font-size: 12pt;">t would be much efficien=
t if we sync using GitHub repo (where I can send PR for you to review).</sp=
an></div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
My primary point of discussion would be the way MRHoF is handled in the dra=
ft.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
The current text/OF described in the document seems insufficient.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
MRHOF makes sense only for metrics that are additive in nature. The CAOFs p=
resented in the document are not additive, and the text simply tries to som=
ehow fit MRHOF in the context.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
The draft reserves different OCPs for different Common Ancestor Policies (S=
trict, Medium, Relaxed). I thought that the policies are local in nature an=
d different nodes in the same instance could use different policies. If we =
use different OCPs, then this is
 not possible. It is impractical to assume that certain policies (such as C=
A Strict policy) can be enforced using OCP.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
&nbsp;</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<span style=3D"color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-s=
erif; font-size: 12pt;">The promiscuous overhearing assumes different secur=
ity settings. I read the refed draft in 6tisch and it explains the assumpti=
ons, however, I believe it is better
 we explain the security implication of promiscuous overhearing in the secu=
rity considerations in this draft.</span></div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Regards,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Rahul</div>
</div>
</body>
</html>

--_000_BM1PR01MB26128F018BFC1088353F7541A9810BM1PR01MB2612INDP_--


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From: Rahul Jadhav <nyrahul@outlook.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: Eliding mechanism in 6550
Thread-Index: AQHVdUhliZ040nQflUyScFbwadE6vQ==
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Subject: [Roll] Eliding mechanism in 6550
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Hello all,

During the interim, we discussed about the eliding mechanism in 6550.
Basically, 6550, allows DIO Configuration Option to be elided for multicast=
 DIO. However, 6550 does not provide any guidelines on how to do it.  We fo=
und that under transient network conditions, it was possible that a node ma=
y continue to use the stale configuration option without realizing that an =
updated option is in circulation.
During the interim Pascal/Michael suggested the use of counter to track the=
 freshness of the Config Option. This could further extend to track MOPex a=
nd CAP options freshness.

The suggestion was to use the reserved bits in the base DIO message for suc=
h a counter.

I was wondering if the DODAGID in the DIO could also be elided under the sa=
me guise? Basically the point is to elide all the "static" information whic=
h rarely changes.
Clearly this has issues in multi-DODAG networks but it is possible to handl=
e such issues. Considering that this directly results in 16 bytes savings p=
er DIO multicast message, do you think it is worth the effort or if there a=
re other issues?

Regards,
Rahul

--_000_BM1PR01MB2612A9D3C37CD5D009626CCFA9810BM1PR01MB2612INDP_
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<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Hello all,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
During the interim, we discussed about the eliding mechanism in 6550.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Basically, 6550, allows DIO Configuration Option to be elided for multicast=
 DIO. However, 6550 does not provide any<span style=3D"color: rgb(0, 0, 0);=
 font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;">&nbsp;guide=
lines on how to do it.&nbsp; We found that under
 transient network conditions, it was possible that a node may continue to =
use the stale configuration option without realizing that an updated option=
 is in circulation.</span></div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<span style=3D"color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-s=
erif; font-size: 12pt;">During the interim Pascal/Michael suggested the use=
 of counter to track the freshness of the Config Option. This could further=
 extend to track MOPex and CAP options
 freshness.</span></div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<span style=3D"color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-s=
erif; font-size: 12pt;"><br>
</span></div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<span style=3D"color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-s=
erif; font-size: 12pt;">The suggestion was to use the reserved bits in the =
base DIO message for such a counter.</span></div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<span style=3D"color: rgb(0, 0, 0); font-family: Calibri, Helvetica, sans-s=
erif; font-size: 12pt;"><br>
</span></div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
I was wondering if the DODAGID in the DIO could also be elided under the sa=
me guise? Basically the point is to elide all the &quot;static&quot; inform=
ation which rarely changes.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Clearly this has issues in multi-DODAG networks but it is possible to handl=
e such issues. Considering that this directly results in 16 bytes savings p=
er DIO multicast message, do you think it is worth the effort or if there a=
re other issues?&nbsp;</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Regards,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);">
Rahul</div>
</body>
</html>

--_000_BM1PR01MB2612A9D3C37CD5D009626CCFA9810BM1PR01MB2612INDP_--


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From: Ines  Robles <mariainesrobles@googlemail.com>
Date: Sun, 29 Sep 2019 23:01:07 +0300
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Archived-At: <https://mailarchive.ietf.org/arch/msg/roll/wpX59bcJscFqyWjIQcfgS3wBS08>
Subject: [Roll] ROLL Interim Meeting - 14 October - Material
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--00000000000024e5140593b6950b
Content-Type: text/plain; charset="UTF-8"

Dear All,

The poll is closed. The selected date is 14th October 2019, from 13pm to
15pm UTC time.

Please find below the webex details, note that the webex is going to be
open 15 minutes before the meeting start time.

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

Webex Details:

Topic: Continue with the work on Capabilities and MOPex
Hosted by ROLL WG

Monday, Oct 14, 2019 8:45 am | 2 hours 15 minutes | (UTC-05:00) Eastern
Time (US & Canada)
Meeting number: 319 527 168
Password: pxT5tCu6
https://ietf.webex.com/ietf/j.php?MTID=mbf22e8e09dfa7a79eccc8646e17153ec


Join by phone
1-650-479-3208 Call-in toll number (US/Canada)
Access code: 319 527 168

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

Etherpad: https://etherpad.ietf.org/p/roll-interim-virtual-meeting-20191014

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

Material to be uploaded into:
https://github.com/roll-wg/ROLL-Interim-Meeting

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

Draft Agenda :
https://github.com/roll-wg/ROLL-Interim-Meeting/blob/master/20191014/Agenda


Comments welcome,

Thank you,

Ines and Peter

On Mon, Sep 23, 2019 at 6:15 PM Ines Robles <mariainesrobles@googlemail.com>
wrote:

> Dear all,
>
> We will host another ROLL Interim Meeting in October to continue the
> discussion from today (
> https://etherpad.tools.ietf.org/p/roll-interim-virtualmeeting-20190923)
>
> Please fill the doodle by this Friday 27th September.
>
> https://doodle.com/poll/z458yk8ck3de6ra8
>
> Thank you,
>
> Ines and Peter.
>
>
>

--00000000000024e5140593b6950b
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div>Dear All,</div><div><br></div><div>T=
he poll is closed. The selected date is 14th October 2019, from 13pm to 15p=
m UTC time.=C2=A0</div><div><br></div><div>Please find below the webex deta=
ils, note that the webex is going to be open 15 minutes before the meeting =
start time.=C2=A0</div><div><br></div><div>--------------------------------=
---------------------------------------------------------------------------=
-------------</div><div><br></div><div>Webex Details:</div><div><br></div>T=
opic: Continue with the work on Capabilities and MOPex<br>Hosted by ROLL WG=
<br><br>Monday, Oct 14, 2019 8:45 am | 2 hours 15 minutes | (UTC-05:00) Eas=
tern Time (US &amp; Canada)<br>Meeting number: 319 527 168<br>Password: pxT=
5tCu6<br><a href=3D"https://ietf.webex.com/ietf/j.php?MTID=3Dmbf22e8e09dfa7=
a79eccc8646e17153ec">https://ietf.webex.com/ietf/j.php?MTID=3Dmbf22e8e09dfa=
7a79eccc8646e17153ec</a><div><br><br>Join by phone<br>1-650-479-3208 Call-i=
n toll number (US/Canada)<br>Access code: 319 527 168<br></div><div><br></d=
iv><div>-------------------------------------------------------------------=
-------------------------------------------------</div><div><br></div><div>=
Etherpad:=C2=A0<a href=3D"https://etherpad.ietf.org/p/roll-interim-virtual-=
meeting-20191014">https://etherpad.ietf.org/p/roll-interim-virtual-meeting-=
20191014</a></div><div><br></div><div>-------------------------------------=
---------------------------------------------------------------------------=
--</div><div><br></div><div>Material to be uploaded into:=C2=A0<a href=3D"h=
ttps://github.com/roll-wg/ROLL-Interim-Meeting">https://github.com/roll-wg/=
ROLL-Interim-Meeting</a></div><div><br></div><div>-------------------------=
---------------------------------------------------------------------------=
-----</div><div><br></div><div>Draft Agenda :=C2=A0<a href=3D"https://githu=
b.com/roll-wg/ROLL-Interim-Meeting/blob/master/20191014/Agenda">https://git=
hub.com/roll-wg/ROLL-Interim-Meeting/blob/master/20191014/Agenda</a></div><=
div><br></div><div><br></div><div>Comments welcome,</div><div><br></div><di=
v>Thank you,</div><div><br></div><div>Ines and Peter</div></div><br><div cl=
ass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Sep 23, 2=
019 at 6:15 PM Ines  Robles &lt;<a href=3D"mailto:mariainesrobles@googlemai=
l.com">mariainesrobles@googlemail.com</a>&gt; wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Dear all,<br><br>We w=
ill host another ROLL Interim Meeting in October to continue the discussion=
 from today (<a href=3D"https://etherpad.tools.ietf.org/p/roll-interim-virt=
ualmeeting-20190923" target=3D"_blank">https://etherpad.tools.ietf.org/p/ro=
ll-interim-virtualmeeting-20190923</a>)<br><br>Please fill the doodle by th=
is Friday 27th September.<br><br><a href=3D"https://doodle.com/poll/z458yk8=
ck3de6ra8" target=3D"_blank">https://doodle.com/poll/z458yk8ck3de6ra8</a><d=
iv><br>Thank you,<br><br>Ines and Peter.<br><br><br></div></div>
</blockquote></div></div>

--00000000000024e5140593b6950b--


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Subject: Re: [Roll] Eliding mechanism in 6550
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--=-=-=
Content-Type: text/plain


Rahul Jadhav <nyrahul@outlook.com> wrote:
    > During the interim Pascal/Michael suggested the use of counter to track
    > the freshness of the Config Option. This could further extend to track
    > MOPex and CAP options freshness.

    > The suggestion was to use the reserved bits in the base DIO message for such a counter.

Yup.

    > I was wondering if the DODAGID in the DIO could also be elided under
    > the same guise? Basically the point is to elide all the "static"
    > information which rarely changes.

    > Clearly this has issues in multi-DODAG networks but it is possible to
    > handle such issues. Considering that this directly results in 16 bytes
    > savings per DIO multicast message, do you think it is worth the effort
    > or if there are other issues?

My question is what are the sizes of the DIOs, and how close are we to
fragmentation already?

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




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From: Rahul Jadhav <nyrahul@outlook.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Eliding mechanism in 6550
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Subject: Re: [Roll] Eliding mechanism in 6550
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    > I was wondering if the DODAGID in the DIO could also be elided under
    > the same guise? Basically the point is to elide all the "static"
    > information which rarely changes.

    > Clearly this has issues in multi-DODAG networks but it is possible to
    > handle such issues. Considering that this directly results in 16 byte=
s
    > savings per DIO multicast message, do you think it is worth the effor=
t
    > or if there are other issues?

My question is what are the sizes of the DIOs, and how close are we to
fragmentation already?

[RJ] The typical size of DIO is 93 bytes in my simulation framework.
ICMPv6 Hdr: 4B
DIO Base object: 8B
DODAGID: 16B
Config Option: 16B
Prefix Info: 32B
Remaining bytes are IPv6 and lower layer headers.
Attached is the pcap.




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<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
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<div class=3D"BodyFragment"><font size=3D"2"><span style=3D"font-size:11pt"=
>
<div class=3D"PlainText">&nbsp;&nbsp;&nbsp; &gt; I was wondering if the DOD=
AGID in the DIO could also be elided under<br>
&nbsp;&nbsp;&nbsp; &gt; the same guise? Basically the point is to elide all=
 the &quot;static&quot;<br>
&nbsp;&nbsp;&nbsp; &gt; information which rarely changes.<br>
<br>
&nbsp;&nbsp;&nbsp; &gt; Clearly this has issues in multi-DODAG networks but=
 it is possible to<br>
&nbsp;&nbsp;&nbsp; &gt; handle such issues. Considering that this directly =
results in 16 bytes<br>
&nbsp;&nbsp;&nbsp; &gt; savings per DIO multicast message, do you think it =
is worth the effort<br>
&nbsp;&nbsp;&nbsp; &gt; or if there are other issues?<br>
<br>
My question is what are the sizes of the DIOs, and how close are we to<br>
fragmentation already?<br>
<br>
[RJ] The typical size of DIO is 93 bytes in my simulation framework.</div>
<div class=3D"PlainText">ICMPv6 Hdr: 4B</div>
<div class=3D"PlainText">DIO Base object: 8B</div>
<div class=3D"PlainText">DODAGID: 16B</div>
<div class=3D"PlainText">Config Option: 16B</div>
<div class=3D"PlainText">Prefix Info: 32B</div>
<div class=3D"PlainText">Remaining bytes are IPv6 and lower layer headers.<=
/div>
<div class=3D"PlainText">Attached is the pcap.</div>
<div class=3D"PlainText"><br>
</div>
<div class=3D"PlainText"><br>
</div>
<div class=3D"PlainText"><br>
</div>
</span></font></div>
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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: [Roll] Eliding mechanism in 6550
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Subject: [Roll] Routing Over Low power and Lossy networks (roll) WG Virtual Meeting: 2019-10-14
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The Routing Over Low power and Lossy networks (roll) Working Group will hold
a virtual interim meeting on 2019-10-14 from 13:00 to 15:00 UTC.

Agenda:
Draft Agenda:

- Configuration Option structure
- Capabilities unaware 6LR
- Bidirectional Capabilities representation

Information about remote participation:
Topic: Continue with the work on Capabilities and MOPex 
Hosted by ROLL WG  
Monday, Oct 14, 2019 8:45 am | 2 hours 15 minutes | (UTC-05:00) Eastern Time (US & Canada) 
Meeting number: 319 527 168 
Password: pxT5tCu6 
https://ietf.webex.com/ietf/j.php?MTID=mbf22e8e09dfa7a79eccc8646e17153ec  
Join by phone 1-650-479-3208 Call-in toll number (US/Canada) Access code: 319 527 168

https://github.com/roll-wg/ROLL-Interim-Meeting

