Re: [v6ops] Updating RFC 7084 - alternate logic

[Olorunloba Olopade <[e-mail]>]

Yes, it is a MUST in the requirements.

I don’t have a large enough pool to conclude how widely it is implemented. But it is implemented (somewhat) in ALL the CPEs I’ve come across.

If the issue is the tree, this is a by product of the physical topology. By avoiding a complex physical topology, we can avoid a complex tree. Personally, I still prefer the tree as it mirrors the topology and would make troubleshooting easier. I expect that it would be more difficult to troubleshoot with relays.

I also don’t see a problem with under utilised prefixes (something we generally don’t have a problem with, when it comes to v6). I see more of a problem where I want something later than a /64, and I cannot get it. Yes, my scenario for wanting something larger than a /64 is possibly not SNAC related, but this comes under general CE requirements.

From: Timothy Winters <[e-mail]>
Sent: 30 November 2022 15:56
To: Olorunloba Olopade <[e-mail]>
Cc: IPv6 Operations <[e-mail]>
Subject: Re: [v6ops] Updating RFC 7084 - alternate logic

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]<mailto:[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]<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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