Hi Marek,

On Thu, Jan 15, 2026 at 09:09:39AM +0100, Marek Zarychta via Bird-users wrote:

After upgrade we spotted small regression with AS-SETs in both 2.18 and 3.2:

That’s not a bug, that’s a feature specified in RFC 9774. We have changed the default behavior.

W dniu 3.01.2026 o 22:44, Maria Matejka via Bird-users pisze:

Also, AS Sets in AS Paths are now considered malformed by default.

If you need to accept AS Sets, you have to explicitly enable them.

Have a nice day!
Maria

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