protocol ospf ospf_ipv4 {
	ipv4 {
		import all;
		import keep filtered;
		import limit 200 action block;
		import filter {
			if (net ~ [ 0.0.0.0/0 ]) then {
				reject;
			}
			else {
				igp_metric = ospf_metric1;
				accept;
			}
		};

		export filter {
			if (proto = "kernel_grt_ipv4" || proto = "direct1" || 
			    source = RTS_DEVICE)
			then {
				accept;
			}
			else reject;
		};
	};

	area 0.0.0.0 {
		interface "gre1" {
			stub;
		};
		interface "gre2" {
			stub;
		};
		include "/etc/bird.lag-*.conf";
	};

	area 4.8.8.4 {
		interface "enp1s0" {
			cost 1;
		};
		interface "enp3s0.50" {
			cost 1;
		};
	};
};