[RFC] Automatic MP peering with IPv6 link local peers

[Ondrej Zajicek]

On Sat, Jul 09, 2022 at 10:53:28AM +0200, Nico Schottelius wrote:
> 
> Good morning^2,
> 
> as virtually all parts in our datacenters have become IPv6 only, I was
> wondering if it was easy to add a feature to bird to automatically BGP
> peer with all alive link local neighbours?
> 
> Motivation and situation
> ------------------------
> 
> Every node has an IPv6 link local address on every network interface.
> Bird already supports dynamic peers, including whitelisting of ranges.
> 
> Instead of specifying specific ranges, it would be great if two or more
> routers could be placed in the same layer 2 segment and would
> automatically BGP peer with each other, thus removing any configuration
> needs.

Hello

It would be easy to add support for interface specification instead of
just IP range (if that is not there already).

The main issue is that dynamic range works primarily as passive, as there
is no neighbor discovery. I think there is some RFC draft for BGP neighbor
discovery, will look for it. Using ping seems like too hacky.

-- 
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."