Re: [v6ops] Updating RFC 7084 - alternate logic

[Esko Dijk <[e-mail]>]

Hello,

> but don’t support limiting the sub-delegation to /64

This looks like the requirement LPD-4 from the draft, correct?
To me it also sounds counter-intuitive to limit it to /64. For example if a /56 is delegated and some PD client in the home asks for a /60, that should be possible.
A stub router as defined in SNAC should ask for a /64 and get a /64 in that case. This follows the RFC 8168 defined logic if I’m correct there.

Regards
Esko

From: v6ops <[e-mail]> On Behalf Of Olorunloba Olopade
Sent: Wednesday, November 30, 2022 16:16
To: Timothy Winters <[e-mail]>; IPv6 Operations <[e-mail]>
Subject: Re: [v6ops] Updating RFC 7084 - alternate logic

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]<mailto:[e-mail]>> On Behalf Of Timothy Winters
Sent: 18 November 2022 14:47
To: IPv6 Operations <[e-mail]<mailto:[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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