Is there a way to filter routes on per neighbor basis in ospf broadcast network? For Eg:, R1,R2 and R3 are in ospf area 1(nssa), R3 being ABR. If R3 receives two routes A and B from Area 0 and the requirement is :
- R1 should receive route A(O IA) only,
- R2 and future routers in this area should receive both the routes
OSPF filtering is tricky because it is a link-state protocol and all the routers in one area should have the same databases. The way to filter information in OSPF is via creating different types of Areas: stub, totally stub, etc.. or at the ABR's/ASBR's with specific commands. There are other ways, but these are the standard ones.
In your case, this would not be possible because LSA type 3 filtering (area 1 filter-list prefix in) could be done in the ABR- R3- but this would affect all the routers in Area 1. Yoy may filter route B in R1 with distribute-list in or distance 255 but, be aware that this will filter the route in the RIB but not the LSA in the database and therefore there is a potential risk of blackholing the traffic in case router 1 is used as transit for prefix B.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...