Hello Robert, I'm afraid we aren't able to easily drop these specific warnings. There are some plans about better granularity of logging but not yet implemented. We'll think about it and try to find some feasible systematic way to achieve that. Thank you for this report! Happy routing! Maria On June 2, 2026 7:07:06 PM GMT+02:00, Robert Scheck <bird@robert-scheck.de> wrote:

Hello all,

after updating a system to BIRD 3.x, I see lots of such log messages:

Jun 02 11:52:34 bird[2664336]: transit6: Malformed AS_PATH attribute - AS_SET segment (1) at 26 Jun 02 11:52:34 bird[2664336]: transit6: Invalid route 2608:12a:7453::/48 withdrawn Jun 02 11:52:34 bird[2664336]: transit6: Invalid route 2608:12a:7426::/48 withdrawn Jun 02 11:52:34 bird[2664336]: transit6: Invalid route 2608:12a:7444::/48 withdrawn Jun 02 11:52:34 bird[2664336]: transit6: Invalid route 2608:12a:7435::/48 withdrawn Jun 02 11:52:34 bird[2664336]: transit6: Invalid route 2608:12a:7425::/48 withdrawn Jun 02 11:52:34 bird[2664336]: transit6: Invalid route 2608:14a:7523::/48 withdrawn Jun 02 11:52:34 bird[2664336]: transit6: Malformed AS_PATH attribute - AS_SET segment (1) at 14

As I personally less care about the invalid routes the US DoD (and others) push into the DFZ, I would like to suppress them (~ 26k log lines within 8 hours) - while still keeping regular BIRD warnings, errors etc.

Maybe I'm overlooking something, but based on the documentation I did not see how I could suppress just "Malformed AS_PATH attribute" and "Invalid route ... withdrawn" log messages?

Any pointers? Thank you.

Regards, Robert

-- Maria Matejka (she/her) | BIRD Team Leader | CZ.NIC, z.s.p.o.