Re: [Anima-bootstrap] Brian: GRASP parameter for registrar discovery by proxy

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 03 March 2017 02:01 UTC

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To: Michael Richardson <mcr+ietf@sandelman.ca>, anima-bootstrap <anima-bootstrap@ietf.org>
References: <20170221155002.GA8168@faui40p.informatik.uni-erlangen.de> <6b414f54-4164-5c9d-390e-30d21f786cca@gmail.com> <18032.1487866082@obiwan.sandelman.ca> <d75d84f5-d4e3-2fe1-a636-3dfbbefc5784@gmail.com> <22816.1488466191@obiwan.sandelman.ca>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Fri, 3 Mar 2017 15:01:55 +1300
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Cc: Toerless Eckert <tte@cs.fau.de>
Subject: Re: [Anima-bootstrap] Brian: GRASP parameter for registrar discovery by proxy
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On 03/03/2017 03:49, Michael Richardson wrote:
> 
> Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
>     > That seems a bit disjoint from "proxy needs to find registrar". And it
>     > definitely
>     > sounds like a two-way conversation, which would more naturally be
>     > modelled as
>     > a negotiation. Can you change that from a "what if?" to a more specific
>     > requirement that we can model?
> 
> There are two aspects.
> 1) In the Circuit Proxy case, it would be good if the Registrar was able to
>    point the Join Proxy at a different device.  Or rather, decline to serve
>    it, "too busy".  M_FLOOD/M_DISCOVER does not provide for this.

True, you would have to build it into the initial BRSKI exchange instead.
With GRASP negotiation, you would just respond with M_END/O_DECLINE.

> 2) In the IPIP case, it might make some implementations easier if the
>    Registrar was aware of the Join Proxy before the traffic arrives, so
>    that the Registrar could configure the appropriate virtual interfaces.

Yes, you could use a O_WAIT to make the proxy wait while doing the setup
and then return any necessary parameters by M_NEGOTIATE, or simply signal
success by M_END/O_ACCEPT.

As you want. At the GRASP store, objectives are free of charge, and
all the best names are still available.

    Brian

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