Sorry my english and my nescience with Bird...I'm starting Bird now, and my new job we use it...

Analyzing config file stay with doubt in section...

protocol static aggregated_nets_v4 {

        ipv4;

        route XXX.XXX.XXX.XXX/22 reject;

        route AAA.AAA.AAA.AAA/22 reject;

        route BBB.BBB.BBB.BBB/22 reject;

        route CCC.CCC.CCC.CCC/22 reject;

}

What would be the meaning of block ?

Is it creating a static entry and rejecting the routes inside the block?