Hi,

this would brake OSPF completely. You can only filter routes between area's and not within. This is fundamental for link state protocols like OSPF

Eelco Nieuwstad

On 27-01-17 08:53, Steve Leung wrote:

Hi,

Using OSPF, when receiving some routes from a network interface, by default all routes will be re-advertised to other interfaces within the same area without applying the filter rules.

Say in the below example.

===

protocol ospf myospf {

        table t_ospf;

        import filter ifilter;

        export filter ofilter;

        area 0 {

                interface "eth*" {

                        hello 10; retransmit 2; wait 10; dead 300; cost 10;

                };

        };

}

===

Routes received from "eth1" will be _forwarded_ to "eth2" and bypassed all the filters. Is it possible to configure bird.conf so only some of the routes will be re-advertised? (aka apply filters to interface within the same OSPF area)

Creating multiple ospf instance and treat the routes as "external routes" (so filter will apply) is not a good idea for me because the environment is quite dynamic, may even have hundreds of dynamic virtual interface, and I hope I do not need to edit the config file all the time.

Thank you so much for your time.

Best regards,
Steve