Re: [v6ops] Updating RFC 7084 - alternate logic

Ted Lemon <mellon@fugue.com> Fri, 02 December 2022 14:24 UTC

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From: Ted Lemon <mellon@fugue.com>
Date: Fri, 02 Dec 2022 09:24:02 -0500
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To: Ole Troan <otroan=40employees.org@dmarc.ietf.org>
Cc: IPv6 Operations <v6ops@ietf.org>, Timothy Winters <tim@qacafe.com>
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Subject: Re: [v6ops] Updating RFC 7084 - alternate logic
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Sorry, autocorrect was “helping”. I meant non-tree topologies. :)

Op vr 2 dec. 2022 om 09:23 schreef Ted Lemon <mellon@fugue.com>

> Op vr 2 dec. 2022 om 08:48 schreef Ole Troan <otroan=
> 40employees.org@dmarc.ietf.org>,
>
>> Regarding the comment below. If two routers are attached to the same
>> link, they will both request a prefix for the link. That’s not what you
>> want.
>>
>
> We have a solution for this for stub router which would work generally.
>
> Regarding relaying, as you say that will work when there are multiple
>> upstream routers. You just need to know where to relay to. Don’t think we
>> can assume site-wide multicast.
>>
>
> In order for relay to be an option, the router that would act as a relay
> must already have done DHCPv6 pd to number the link to which the subsidiary
> requesting router is attached. So there is no need for site-wide multicast
> here.
>
>>
>> Regarding multihoming. MPMH is unlikely to ever work well, so I am also
>> (unhappily) accepting to drop that.
>>
>
> Not ready to give up on this yet, but I agree that it is out of scope.
>
> BTW, regarding Jon-tree topologies, from the perspective of a requesting
> router, there will always be a direct path to the delegating router. If
> there are two paths, the same prefix will be assigned over both paths. I
> think this means that a loop can’t happen and you don’t need spanking tree,
> but we’d need to think about it. Again out of scope for this document,
> though—this document is about address allocation, not routing.
>
>>