[Roll] RUL and RootACK

Rahul Jadhav <nyrahul@outlook.com> Thu, 04 June 2020 13:00 UTC

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From: Rahul Jadhav <nyrahul@outlook.com>
To: Routing Over Low power and Lossy networks <roll@ietf.org>, "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Thread-Topic: RUL and RootACK
Thread-Index: AQHWOm9rGH6iTT+tOUic/QS+X0LEEQ==
Date: Thu, 04 Jun 2020 12:59:51 +0000
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Subject: [Roll] RUL and RootACK
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Hi Pascal,

Last we discussed handling storing mode RUL flow with RootACK in a way that NA is sent to the RUL after it gets the RootACK. This way RUL can initiate its app traffic once e2e path is established.

Figure 9 in https://tools.ietf.org/html/draft-ietf-roll-unaware-leaves-15#section-9.1.2 handles Storing mode First registration flow for RULs.

My problem is (consider the figure 9), how will the Root know whom to send the RootACK. In the regular cases, the target node in DAO is the destination for RootACK. But in this case, the target is RUL and RootAck cannot be sent to RUL. For external targets, can we use ParentAddr in Transit Information Option to send this field? Anyways the 6LR indeed is the parent node for RUL.

Any thoughts/suggestions?

Thanks,
Rahul