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Re: [v6ops] Updating RFC 7084

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 18 November 2022 20:03 UTC

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Date: Sat, 19 Nov 2022 09:02:08 +1300
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To: Timothy Winters <tim@qacafe.com>, IPv6 Operations <v6ops@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [v6ops] Updating RFC 7084
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On 19-Nov-22 03:47, Timothy Winters wrote:
> 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/ <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.

As a historical note, we've spent a lot of time in the past on multi-homing
and more or less failed (and the HOMENET approach was designed for home nets,
not for enterprises where the problem is probably more important).

To summarise what I've said over on SNAC:

1. If we're going to mention PvDs in the 7084 update, I think we should
also mention RFC 8028. It isn't that a CE router should necessarily
support 8028, but that in a network that does implement 8028 on its subnet
routers, the following part of 8028 applies:

2.2.  Expectations of Multihomed Networks

    Networking equipment needs to support source/destination routing for
    at least some of the routes in the Forwarding Information Base (FIB),
    such as default egress routes differentiated by source prefix.
    Installation of source/destination routes in the FIB might be
    accomplished using static routes, Software-Defined Networking (SDN)
    technologies, or dynamic routing protocols.

Those egress routes of course lead to CE routers.

(There is some other thinking about this topic in draft-vv-6man-nd-support-mhmp).

    Brian


> 
> I welcome any feedback about the proposal.
> 
> ~Tim
> 
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