DHCPv6 relay with PD

Erik Muller erikm at buh.org
Wed Jul 13 19:28:47 CEST 2016

On 6/8/16 20:37 , Erik Kline wrote:
> On 9 June 2016 at 03:16, Ole Troan <ot at cisco.com> wrote:
>> Mikael,
>>>> We also tried (and failed) to come up with a secure mechanism for the requesting router to advertise it's delegated prefix to first-hop routers.
>>>> Less astonished? ;-)
>>> Well, I guess I shouldn't be astonished. I've even seen vendors implement the DHCPv6-PD server on the router itself, and fail to install route according to the delegated prefix.
>>> So basically, regarding how to actually implement PD in a network (from an IETF point of view), everybody just gave up, declared the problem unsolvable, and went back to sleep?
>> It shouldn't be the IETF's job to tell people how to run their networks.
>> The IETF provides the building blocks.
> But this sounds like what's missing is operational guidance on what
> collections of blocks have been known to work.

The Broadband forum TR-177 guidelines[1] provide at least one approach for
how to put it together, if you need a standards-compliance reference to
cite.  (tl;dr: "if you're a BNG and you relay or serve a PD prefix, you
need to also route it to the client").
I know Nokia/Alcatel-Lucent 7750s implement routing properly for relayed PD
blocks.  I've had it working on Brocade MLXes and cisco ASR1k as well.
(ISTR an earlier MLX version implemented relay without route insertion, but
that was just as an interim release while they were finishing development,
and likely other gear has had similar times where that half-implemented
feature made it out the door.)


1. https://www.broadband-forum.org/technical/download/TR-177.pdf

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