Hello, thanks for the bug report, it seems that it is in fact an bird v3 issue. I've tried it in our testing setup and can confirm that it is happening. We will fix it ASAP. Thanks again, David On 1/12/25 11:23, Aihui Sun wrote:

Hi,there! Cannot access value of igp_metric from within filter. e.g igp_metric = igp_metric + 100; The igp_metric value does not change. Is there something wrong with my operation? Thanks

-- David Petera (he/him) | BIRD Tech Support | CZ.NIC, z.s.p.o.