Bird 2 config syntax

[Vincent Bernat]

 ❦ 21 September 2021 15:23 +02, Robert Sander:

> why is it not possible to define BGP sessions like this?
>
> protocol bgp g60 {
> 	local as 64501;
> 	neighbor as 64499;
> 	ipv4 {
> 		import all;
> 		export all;
> 		};
> 		local 192.0.2.4;
> 		neighbor 192.0.2.5;
> 	};
> 	ipv6 {
> 		import all;
> 		export all;
> 		local 2001:db8::4;
> 		neighbor 2001:db8::5;
> 	};
> };
>
> It seems still necessary to write two bgp definitions separately for
> IPv4 and IPv6 repeating the AS numbers and name.
>
> I see no benefit from the Bird 1.6 notation here.

With BIRD2, you can transport your IPv4 routes over an IPv6 BGP session.
To not repeat stuff, you can use templates.
-- 
Localise input and output in subroutines.
            - The Elements of Programming Style (Kernighan & Plauger)