OSPF anycast prefix being filtered

[Pavlos Parissis]

On 31/03/2015 06:41 μμ, Patrik Lundin wrote:
> Hello,
> 
> I am trying to use BIRD for anycasting a /32 prefix via OSPF and I am
> not able to get the announcement to work.
> 
> My idea is to have the server use the normal default gw for routing
> packets. Because of this I see no reason for importing routes from
> OSPF into the kernel routing table, I am only interested in exporting
> the anycast address that is configured on the loopback interface.
> 
> I configure a /32 prefix on the loopback interface like so:
> ===
> # ip address add yyy.yyy.yyy.yyy/32 dev lo
> ===
> 
> My bird.conf looks like this:
> ===
> router id xxx.xxx.xxx.xxx;
> 
> debug protocols all;
> 
> protocol device {}
> 
> protocol ospf {
>     import none; # Default is import all
>     export all;
>     area 0.0.0.0 {
>         interface "eth*" {
>             authentication cryptographic;
>             password "pass";
>         };
>         interface "lo" {};
>     };
> }

You need to enable direct protocol as well which will import routes
to the routing table of Bird, here is an example conf

define ANYCAST_NETWORKS =
   [
       10.252.12.0/24{32,32}

   ];
protocol direct direct1 {
    interface "lo";
        debug all;
        export none;
        import where net ~ ANYCAST_NETWORKS;
}


Cheers,
Pavlos


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