Re: [v6ops] Updating RFC 7084 - alternate logic

[Ole Troan <[e-mail]>]

When there was interest in DHCP PD for prefix assignment, two models were proposed. One called hierarchical PD and the other flat assignment. 

In the flat mode a PD client can ask for multiple /64s. 

Which is the model I believe you suggest Tim. 

O

On 30 Nov 2022, at 16:56, Timothy Winters <[e-mail]> wrote:



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/" target="_blank" rel="nofollow">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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