Re: [v6ops] Updating RFC 7084 - alternate logic

[Timothy Winters <[e-mail]>]

Hi Olorunloba,

I was aware of the requirements, there were a couple of things I was trying
to avoid.   This model creates a tree that can lead to under
utilized prefixes which was somehting I wanted to avoid.  Additionally, I'm
aware that it's not widely implemented due to the complexity.   Do you know
if all eRouters are required to support this?

~Tim
On Wed, Nov 30, 2022 at 10:16 AM Olorunloba Olopade <
[e-mail]> wrote:

> Hello,
>
>
>
> Wile RFC7084 doesn’t cover the DHCP requirements, there are other spec
> (e.g. cablelabs) that does. And we have implementation of this.
>
>
>
> I agree that we should support DHCP on the CE, but don’t support limiting
> the sub-delegation to /64, which would make some of the current
> implementations non-compliant. I will suggest something like the following,
> which is an amendment of the cablelabs spec
>
>
>
> • If the Topology mode is set to “favor config”, then divide the delegated
> prefix into sizes specified by the CE config.
>
> • If the provisioned MSO assigned IA_PD is smaller than a /56 (e.g., a
> /60) and the Topology mode is set to "favor depth", the CE MUST divide the
> delegated prefix on two (2)-bit boundaries into four (4) sub[1]prefixes by
> default.
>
> • If the provisioned MSO assigned IA_PD is smaller than a /56 (e.g., a
> /60) and the Topology mode is set to "favor width", the CE MUST divide the
> delegated prefix on three (3)-bit boundaries into eight (8) sub[1]prefixes
> by default.
>
> • If the provisioned MSO assigned IA_PD is a /56 or larger and the
> Topology mode is set to "favor depth", the CE MUST divide the delegated
> prefix on three (3)-bit boundaries into eight (8) sub-prefixes by default.
>
> • If the provisioned MSO assigned IA_PD is a /56 or larger and the
> Topology mode is set to "favor width", the CE MUST divide the delegated
> prefix on four (4)-bit boundaries into sixteen (16) sub-prefixes by default.
>
> • If the provisioned MSO assigned IA_PD is too small to divide in the
> manner described, the CE MUST divide the delegated prefix into as many /64
> sub-prefixes as possible and log an error message indicating the fault
>
>
>
>
>
> *From:* v6ops <[e-mail]> *On Behalf Of *Timothy Winters
> *Sent:* 18 November 2022 14:47
> *To:* IPv6 Operations <[e-mail]>
> *Subject:* [v6ops] Updating RFC 7084
>
>
>
> Hello,
>
>
>
> I've started a draft to update RFC 7084 to support prefix delegation on
> the LAN interfaces.  The current state of IPv6 in home networks is ISP are
> assigning prefixes of appropriate sizes but they currently are under
> utilized due to the lack of prefix delegation on LAN interfaces.
>
>
>
> This draft is an attempt to add that support to the draft.
>
>
>
> https://datatracker.ietf.org/doc/draft-winters-v6ops-cpe-lan-pd/
>
>
>
> This is only an update to 7084 at the moment, there has been some
> discussion on the snac working group about leveraging this work as well.
>
>
>
> One item being discussed is this currently doesn't solve multi-homed
> networks.
>
>
>
> I welcome any feedback about the proposal.
>
>
>
> ~Tim
>
>
>
>
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