Re: [Roll] AddRE: AD Review of draft-ietf-roll-unaware-leaves-18 (cont)

Alvaro Retana <aretana.ietf@gmail.com> Mon, 09 November 2020 19:13 UTC

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From: Alvaro Retana <aretana.ietf@gmail.com>
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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, "draft-ietf-roll-unaware-leaves@ietf.org" <draft-ietf-roll-unaware-leaves@ietf.org>
Cc: "roll-chairs@ietf.org" <roll-chairs@ietf.org>, Routing Over Low power and Lossy networks <roll@ietf.org>, Rahul Jadhav <rahul.ietf@gmail.com>
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Subject: Re: [Roll] AddRE: AD Review of draft-ietf-roll-unaware-leaves-18 (cont)
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On November 9, 2020 at 3:58:44 AM, Pascal Thubert wrote:


Pascal:

Hi!

I'm ok with the document as is...just one comment remaining.  You can
take it as a Last Call comment.

I'll start the IETF LC when I get updated versions of both this and
UseofRPLInfo.  If you're ready to submit before the window opens
again, feel free to ask the Secretariat (ietf-secretariat@ietf.org)
for manual posting -- I'll approve.

Thanks!

Alvaro.




...
> > > Nothing prevents a packet coming in a RPL domain to carry an RPI.
.
> > Should any of this be also in UseofRPLInfo? Or maybe it should be
> > explained there and referenced form here. UseofRPLInfo talks about
> > always inserting the RPI at the 6LR, no exceptions.
> >
>
> I'll open a thread; your point on the security section could be reflected
> there, that if the external destination passes a packet with a RPI then the
> RPI should be revisited or encapsulated.


As I was reading UseofRPLInfo-41...  §6 (Use Cases) now says this (one
of the assumptions in the use cases):  "For traffic leaving a RUL, if
the RUL adds an opaque RPI then the description of the RAL applies."

This is what I was looking for (in UseofRPLInfo) in terms of how to
handle an RPI from the RUL.  There is however a difference between
what is now written in unaware-leaves and what UseofRPLInfo says (in
the "RAL to..." cases).  In general, UseofRPLInfo says that the 6LR
modifies the RPI, but provide no details except for mentioning the
rank...  The difference is that unaware-leaves says that if the sender
was a RUL then the 6LR "SHOULD rewrite the RPI".

I think that we could simply add the Normative text from above to the
sentence in §6/UseofRPLInfo to bring them all in sync:

NEW>
   - For traffic leaving a RUL, if the RUL adds an opaque RPI then the
     description of the RAL applies.  The 6LR as a RPL border router SHOULD
     rewrite the RPI to indicate the selected Instance and set the flags.