What are you using the prefix set for in the first place? On Thu, May 11, 2023, 2:34 AM William <bird@is.unlawful.id.au> wrote:
On 10/05/2023 19:46, Maria Matejka via Bird-users wrote:
Hello!
Thanks for replying.
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.
Yeah, that could hurt.
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.
We have a number of remote sites where there are non-dynamically routed downstream subnets that we need to add as static routes (anything from 1 to 20+ per site) but also advertise upstream back into the WAN.
Instead of specifying each prefix as an individual static route I was hoping to be able to use the existing prefix set to act as a list of routes to add. If there was a way to iterate over the set in a loop fashion then that would suffice. In our instance there aren't modifiers on the masks (no -'s, +'s or {minlen, maxlen}) hence the idea of being able to use the set as "just a list" - this could be a condition of using it for that function.
For example (twist on my original):
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; } for ThisRoute in my_route_set { route ThisRoute via 192.168.55.2; # downstream static gateway } route 5.6.7.8/32 via 192.168.55.1; }
Resulting in: bird> sh route table Some_Routes Table Some_Routes: 10.1.2.3/24 unicast [route_set 2023-05-10] * (200) via 192.168.55.2 on ens256 10.20.4.2/24 unicast [route_set 2023-05-10] * (200) via 192.168.55.2 on ens256 10.200.0.0/23 unicast [route_set 2023-05-10] * (200) via 192.168.55.2 on ens256 5.6.7.8/32 unicast [route_set 2023-05-10] * (200) via 192.168.55.1 on ens256 192.168.55.0/24 unicast [Local_Ints 2023-05-10] * (240) dev ens256 bird>
Hope that explains better what I'm hoping to achieve. I couldn't see a way of doing it with if..then..else or case statements. The only other option would be to have a script scrape the set out of the config and prepare an include file *shudder*.
Regards, William