Re: [Anima] Rtgdir last call review of draft-ietf-anima-autonomic-control-plane-24

Michael Richardson <> Fri, 10 April 2020 21:27 UTC

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From: Michael Richardson <>
To: "Joel M. Halpern" <>, Brian E Carpenter <>,,,,
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Date: Fri, 10 Apr 2020 17:27:00 -0400
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Subject: Re: [Anima] Rtgdir last call review of draft-ietf-anima-autonomic-control-plane-24
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Joel M. Halpern <> wrote:
    > On Loopback, I understand your frustration with the lack of a good
    > definition.  Given that IPv6 addressing architecture constraints, you need
    > some sort of interface.  In practice, the way loopbacks are used seems to
    > match the need.  So I do not object to the usage.  just to the definition.
    > It would also be acceptable to simply craft a different term and clearly
    > define it if the usage is sufficiently different from existing
    > practice.

Reading this thread, I was hoping you might be able to help us with a better
definition then :-)

We are doing exactly what OSPF and BGP does operationally on every platform
that I have every worked on.  We are just doing it with RPL.

To me, it's *SO* obvious that it goes without saying, so now we are asked to
say it, and we get into trouble because nobody before us bothered to say it.

    > On the final minor comment, it was specifically about the section on L2
    > devices.  Maybe something special is needed for the special case of a shared
    > network that is also a border network.  But that seems very rare. And getting
    > the L2 switch to do the right packet forwarding for the hybrid case seems an
    > invitation to trouble.

I'm not happy about any of the L2 text; I would have left it out completely.

Michael Richardson <>ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-