Is it possible to apply filter on OSPF interfaces within the same area?

[Eelco Nieuwstad]

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
>
>

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