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@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