[Roll] DAP projection vs. Useofrplinfo

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Mon, 05 October 2020 16:54 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: DAP projection vs. Useofrplinfo
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Subject: [Roll] DAP projection vs. Useofrplinfo
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Dear all

I added text in the Github repo of DAO projection to clarify the encapsulation in case of a projected route.
The text says
"
*  This draft conforms the principles of [USEofRPLinfo] with regards
      to packet forwarding and encapsulation along a Track.

      -  In that case, the Track is the DODAG, the Track Ingress is a
         RAL, and the Track Egress is the Root.

      -  If the Track Ingress is the originator of the packet and the
         Track Egress is the destination of the packet, there is no need
         for an encapsulation.

      -  But since the RPL Instance a Local one, the final destination
         in the outer header of a packet sent along a Track MUST be the
         Track Egress.  So the Track Ingress MUST encapsulate its own
         traffic if the destination is reached over the Track via the
         Track Egress but is located beyond it (this is a MAY for a
         Global Instance in [USEofRPLinfo])

      -  Traffic that is injected in the Track is processed as external,
         so it is subject to encapsulation.
"

You'll note that a MAY (in RAL to Int) in fig 7 of useofrplinfo becomes a MUST, because we need to signal the Track Egress.



+---------------------+--------------+------------+----------------+
   | Interaction between |   Use Case   |IPv6-in-IPv6|IPv6-in-IPv6 dst|
   +---------------------+--------------+------------+----------------+
   |                     |  RAL to root |    No      |      N/A       |
   +                     +--------------+------------+----------------+
   |     Leaf - Root     |  root to RAL |    No      |      N/A       |
   +                     +--------------+------------+----------------+
   |                     | root to RUL  |   must     |       6LR      |
   +                     +--------------+------------+----------------+
   |                     | RUL to root  |   must     |       root     |
   +---------------------+--------------+------------+----------------+
   |                     |  RAL to Int  |   may      |      root      |
   +                     +--------------+------------+----------------+
   |   Leaf - Internet   |  Int to RAL  |   must     |      RAL (tgt) |
   +                     +--------------+------------+----------------+
   |                     |  RUL to Int  |   must     |       root     |
   +                     +--------------+------------+----------------+
   |                     |  Int to RUL  |   must     |       6LR      |
   +---------------------+--------------+------------+----------------+
   |                     |  RAL to RAL  |    No      |      N/A       |
   |  Leaf - Leaf        +--------------+------------+----------------+
   |                     |  RAL to RUL  |    No(up)  |      N/A       |
   |                     +              +------------+----------------+
   |                     |              | must(down) |      6LR       |
   |                     +--------------+------------+----------------+
   |                     |  RUL to RAL  |   must(up) |      root      |
   |                     |              +------------+----------------+
   |                     |              | must(down) |      RAL       |
   |                     +--------------+------------+----------------+
   |                     |  RUL to RUL  |   must(up) |      root      |
   |                     |              +------------+----------------+
   |                     |              | must(down) |      6LR       |
   |---------------------+--------------+------------+----------------+


It's because the text in use of RPL info assumes that the RAL injects traffic in a global instance. Should we add a note for that case?
The MAY is a MUST in a local instance.

Keep safe.

Pascal



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Pascal Thubert
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