OSPF_example

OSPF example

Here is a simple and typical example of BIRD used as an OSPF router. Router has several interfaces: eth0 is connected to the local ethernet switch, eth1 and eth2 are ethernet ptp links to other routers, ath0 is a local wifi AP and ath1, ath2 are wifi ptp links to other routers. Wifi devices are Atheros with madwifi driver, hence athX device names.

Fast ethernet links use cost 5 and (slower) wifi links use cost 100. Default OSPF parameters (hello, dead, ...) are changed, because default ones are too conservative. dead parameter on wifi links is larger, because these devices sometimes experience a drop-out for tens seconds.

Static protocol is used for leaf networks hidden behind a neighor router that does not speak OSPF. These static routes are propagated to OSPF, because they are accepted in the OPSF export filter, where also type 1 OSPF metric of 1000 is assigned to them.

log syslog all;

router id A.B.C.D;

protocol device {
        scan time 10;
}

protocol kernel {
        export all;
        scan time 15;
}

protocol static {
        import all;

        route 192.168.X.Y/24 via 192.168.A.B;
        route 192.168.X.Z/24 via 192.168.A.B;
}

protocol ospf {
        import all;
        export filter {
                ospf_metric1 = 1000;
                if source = RTS_STATIC then accept; else reject;
        };

        area 0 {
                interface "eth0" {
                        cost 5;
                        type broadcast;
                        hello 5; retransmit 2; wait 10; dead 20;
                        authentication cryptographic; password "XXXX";
                };

                interface "eth1", "eth2" {
                        cost 5;
                        type pointopoint;
                        hello 5; retransmit 2; wait 10; dead 20;
                        authentication cryptographic; password "XXXX";
                };

                interface "ath0" {
                        cost 1000;
                        type broadcast;
                        hello 5; retransmit 2; wait 10; dead 60;
                        authentication cryptographic; password "XXXX";
                };

                interface "ath1", "ath2" {
                        cost 100;
                        type pointopoint;
                        hello 5; retransmit 2; wait 10; dead 60;
                        authentication cryptographic; password "XXXX";
                };

                interface "*" {
                        cost 1000;
                        stub;
                };
        };
}