Re: [Roll] useofrplinfo version 5

Michael Richardson <mcr+ietf@sandelman.ca> Mon, 18 July 2016 15:00 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Date: Mon, 18 Jul 2016 10:32:20 -0400
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Subject: Re: [Roll] useofrplinfo version 5
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Cenk Gündogan <cnkgndgn@gmail.com>; wrote:
    >> Other question: how does the last 6LR know that the next node is a
    >> not_Raf?

    > I would try to answer this question in the following way:

    > I expect routes that were found _not_ with RPL, but e.g. configured
    > manually or through any other mechanism to be marked somehow
    > differently than routes that were accumulated with DAOs.  How to mark
    > routes "differently" seems to be implementation specific.  (but this
    > information would be used to fill in the `E` flag of Transit Options in
    > DAOs later).

yes, one would expect the neighbour cache to have a direct (connected) route
to a non-RPL aware node that was discovered through neighbour
discovery. (NS/NA).

    > So, if a rpl router forwards a packet downwards (storing-mode), it
    > somehow needs to know whether the (dst;next-hop) pair in a forwarding
    > table is rpl-born or not. If it is not rpl-born, then the IPIP header
    > containing the RPI must be removed before continuing the forwarding
    > process, otherwise the IPIP+RPI is re-added and targeted to the
    > next-hop.

    > You probably noticed that I used many "somehows" and generalized a lot
    > in the text above, but this process looks very blurry to me.  Any RPL
    > veterans available to make things clearer?

Actually, that's the point of this document: it's blurry for many!

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