[RFC] Automatic MP peering with IPv6 link local peers

[Hugo Slabbert]

> ...especially when it is already implemented by other vendors.

Cisco NXOS does similar, yea:

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus9000/sw/93x/unicast/configuration/guide/b-cisco-nexus-9000-series-nx-os-unicast-routing-configuration-guide-93x/b-cisco-nexus-9000-series-nx-os-unicast-routing-configuration-guide-93x_chapter_011110.html#id_123700

> You can configure BGP Interface Peering via IPv6 Link-Local for IPv4 and
IPv6 Address Families for automatic BGP neighbor discovery using unnumbered
interfaces. Doing so allows you to set up BGP sessions using an interface
name as a BGP peer (rather than interface-scoped addresses). ***This
feature relies on ICMPv6 neighbor discovery (ND) route advertisement (RA)
for automatic neighbor discovery and on RFC 5549 for sending IPv4 routes
with IPv6 next hop.***


On Thu, Jul 14, 2022 at 9:09 AM Ondrej Zajicek <santiago at crfreenet.org>
wrote:

> On Thu, Jul 14, 2022 at 05:36:20PM +0200, Marco d'Itri wrote:
> > 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.
>
> Hmm, using Router Advertisements for BGP neighbor discovery is an
> interesting idea, especially when it is already implemented by other
> vendors.
>
> We already have support for extended next hop (RFC 5549, where RFC 8950
> is just a minor update).
>
> --
> Elen sila lumenn' omentielvo
>
> Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net
> <https://isolate-menlo.menlosecurity.com/0/eJyrViotylGyUsooKSmw0tcvLy_PTq0s1itIL9DLSy1R0lEqyleyMtRRKslMAaoyNFWqBQCs2g_C>
> )
> "To err is human -- to blame it on a computer is even more so."
>
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