Re: Redistribute loopback in OSPF

17 May 2017

      Anno domini 2017 Quentin Ritoul scripsit:

Hi,
...
I'm starting to use Bird, and I try to redistribute loopback in ospf. (So
it seems easy...)
[...]
...
Below the configuration of rt01 and rt02 :
rt01 :
filter loopbacks {
        if (net = 10.99.99.1/32 ) then accept;
        else reject;
}
protocol ospf {
        import all;
        export filter loopbacks;
area 0 {
                interface "ens18" {
                        cost 5;
                        type broadcast;
                        hello 5; retransmit 2; wait 10; dead 20;
                        authentication cryptographic; password "toto";
                };
};
}
[...]
You are missing the piece where bird learns about the prefix(es) on
the "lo" interface. That would be a "protocol direct" for example.

For IPv4 the simplest way is to add "lo" as a stub interface (== learn
prefixes but don't actually speak the OSPF protocol)

protocol ospf {
	import all
	export none;

	area 0 {
		...

		interface "lo" {
			stub yes;
		};
	};
}

For IPv6 you need some hack, due to a limitation within bird (which I
hope some of the authors will explain to me ;)):

I use this the following way:

protocol direct lo_v6 {
	interface "lo";
}

protocol ospf {
	import all;
	export where protocol = "lo_v6";

	area 0 {
		...
	};
}

Best
Max
-- 
"Wer nicht mehr liebt und nicht mehr irrt, der lasse sich begraben."
 -- Johann Wolfgang von Goethe

Re: Redistribute loopback in OSPF

Maximilian Wilhelm