Using as set a list of routes to advertise

[Maria Matejka]

Hello!

On 5/10/23 11:13, William wrote:
> Hi All,
> I've been digging around trying to find a nice way of doing it but can't 
> seem to find a valid answer.
> 
> Is there a way to use a prefix set to create static routes?

No, this is not possible and implementing this would be surprisingly 
difficult as the prefix sets are implemented as a compressed trie 
optimized for fast lookup and not enumeration.

Also imagine this:

   define my_route_set = [ 2001:db8/32+ ]; # note the plus sign
   protocol static { ipv6; route my_route_set via 2001:db8::dead:beef; }

This short code would generate approx. 7.9e28 routes.

If you could elaborate more precisely what you are trying to achieve as 
a whole result, we may try to help you find how to do it in the way BIRD 
is designed.

Maria



> Ideally though being able to specify the set as the route to be added 
> would be ideal.  An alternative of something like a "for" loop that 
> iterate through the set and adds the routes to the table would suffice.
> 
> For example:
> 
> define my_route_set = [ 10.1.2.3/24, 172.20.4.2/24, 10.200.0.0/23 ];
> 
> protocol static route_set {
>    ipv4 {
>      table Some_Routes;
>    }
>    route my_route_set via 192.168.55.2;    # downstream static gateway
> }
> 
> The prefix set is used to define the subnets for a remote node and used 
> in import/export filters via BGP upstream.  Being able to re-use the set 
> without having to split it out would be hugely advantageous.
> 
> I want to avoid having the neighbour device provide the routes via a 
> routing protocol where it can be avoided.
> 
> TIA.
> 
> Regards,
> William