[v6ops] Re: DHCPv6 PD in a multi-prefix environment

[Ted Lemon <[e-mail]>]

Can you give us an example of a situation where such a decision would need
to be made?

On Tue, Jul 23, 2024 at 6:48 PM David Farmer <farmer=
[e-mail]> wrote:

> The classic ISP use case for DHCPv6 PD, as envisioned initially by RFC3633
> and integrated into RFC8415, typically expected a single prefix to be
> delegated to a requesting router from the ISP. Meanwhile, many of the
> draft-ietf-v6ops-cpe-lan-pd use cases probably expect a subdelegation from
> this ISP provided prefix. Nevertheless, an RFC7084 CE Router may also have
> a ULA prefix to subdelegate from, and a ULA prefix may be more appropriate
> for some of the use cases. Not to mention, there may be prefixes from more
> than one ISP or additional prefixes while renumbering.
>
> Should the delegating router in draft-ietf-v6ops-cpe-lan-pd advertise
> subdelegations from all prefixes it may have and let the requesting router
> choose one or more? How does the requesting router know which prefixes it
> is appropriate to select in what circumstances? If the delegating router
> doesn't advertise subdelegations from all prefixes, how does it know which
> prefixes to advertise to which requesting routers?
>
> You can also ask the question from the opposite direction: How does the
> requesting router solicit for a ULA prefix instead of a GUA prefix if that
> is more appropriate for its use case?
>
> These questions came to mind while reading draft-ietf-snac-simple, as it
> would seem reasonable to want the SCAC router to obtain a ULA prefix from
> the delegating router and not a GUA prefix, especially in the scenario
> described in A.3. However, similar questions exist for downstream RFC7084
> or PD-per-device in a multi-prefix environment.
>
> Thanks.
> --
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