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Re: [Roll] Published draft-ietf-roll-unaware-leaves-03

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Mon, 02 September 2019 15:19 UTC

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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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Date: Mon, 02 Sep 2019 15:19:14 +0000
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Subject: Re: [Roll] Published draft-ietf-roll-unaware-leaves-03
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Hello Michael 

Please see below 

> Le 2 sept. 2019 à 17:01, Michael Richardson <mcr+ietf@sandelman.ca> a écrit :
> 
> 
> 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.

Indeed 

My early implementation would have partial storing mode state and inject record route in the packet going up when the previous hop for the packet wouldn’t match the next hop in the root. 

> 
>> *   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) =>
>> (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.
> 

Would you take the pen for this and the root capability? I’m looking at the mop draft in parallel 

All the best,

Pascal 


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