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

[Steve Leung]

Yea I know this is not standard, but for some reason I need to figure out
how to handle this scenario, you know sometimes we do not have control of
the whole network :(

Best regards,
Steve


2017-01-27 21:52 GMT+08:00 Eelco Nieuwstad <eelco.nieuwstad at columbo.nl>:

> 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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