[RFC] Automatic MP peering with IPv6 link local peers

[Hugo Slabbert]

We did similar at a previous gig, though the switches did not support BGP
unnumbered so there was an initial DHCP bootstrap to hit a couple of
microservices to retrieve identity info (upsert local server's ASN;
retrieve switch peer ASNs), but then turned up peering and off you go.

But I digress:
It would be fantastic if BIRD could support interface-specified unnumbered
BGP over IPv6 LL with an RA bootstrap and 5549-based 4-over-6.

On Thu, Jul 14, 2022 at 2:42 PM Douglas Fischer <fischerdouglas at gmail.com>
wrote:

> This thread reminded me of something I saw these days about using BGP
> unnumbered in Hypervisors for EVPN/VXLAN.
>
> I confess that I was completely stunned to see how beautiful it was!
>
> - The 4 ports of each Server became a CLOS L3 topology.
> - The complexities of Multichassis-LAG no longer exist.
> - The establishment of neighborhoods was almost automatic.
> - And the ToR switches became only simple L3 routers, without even knowing
> of the existence of Overlay. Which made them much cheaper and simpler to
> operate.
>
> Em qui., 14 de jul. de 2022 às 12:40, Marco d'Itri <md at linux.it> escreveu:
>
>> On Jul 14, Ondrej Zajicek <santiago at crfreenet.org> wrote:
>>
>> > > RFC 8950 is what has been implemented in Cumulus.
>> > Not sure how that is relevant, RFC 8950 is just IPv6 next hop for IPv4
>> > routes, it does not handle BGP neighbor discovery.
>> Discovery is just looking at Router Advertisements for the link, then
>> you need RFC 8950.
>>
>>
>> https://www.theasciiconstruct.com/post/cumulus-basics-part-v-bgp-unnumbered/
>> <https://isolate-menlo.menlosecurity.com/0/eJwNzDkOhDAMAMC_uMZYFDT5TWIiiEQO-SDFav8O84D5gcsNAS6zoYFozrnalaNyKdybmjjbyr3S6GrEXv12xRS1sOKIYvhgOgd6a15TlnwQLCAdwraAleO7tx3-L-LkJKs>
>>
>> https://www.theasciiconstruct.com/post/junos-bgp-and-bgp-unnumbered/#bgp-unnumbered-bgp-auto-discovered-neighbors
>> <https://isolate-menlo.menlosecurity.com/0/eJxVjrsOgzAMRf_FXQkRQ5f8DXmIGIEdxXYzVP13Kjp1ujpHZ7hvsH5AgKraJHg_xpi1llUSYmIS7ZZ0Tnz6xqJ-N2JxcWtupXyvEdkZSy_ZP_75l5myyyiJX7ejgluN3AUm6AxhmUAxfw8sT_hciJ4ytg>
>>
>> --
>> ciao,
>> Marco
>>
>
>
> --
> Douglas Fernando Fischer
> Engº de Controle e Automação
>
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