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OSPF filter-list

williams-thomas
Level 1
Level 1

R1 --------R2----------R3----------R4
         area1 NSSA           (r3abr)    area0

Router 1 is redistributing lo0 1.1.1.1 (N2). On the ABR, I want to filter 1.1.1.1/32  route from going to Area0 using filter list and it is not working.

ABR R3
!
ip prefix-list R4EXTR seq 5 deny 1.1.1./32
ip prefix-list R4EXTR seq 10 permit 0.0.0.0/0 le 32
!
router ospf 1
router-id 33.33.33.33
area 0 filter-list prefix R4EXTR in
!
I also tried area1  filter-list prefix R4EXTR out 

* I am not seeing hits on the prrefix  
!
sh ip prefix-list R4EXTR seq 5
seq 5 deny 1.1.1.1/32 (hit count: 0, refcount: 1)

 

3 Replies 3

Try use in ASBR nssa-only' this will make ABR between area0 and areax (nssa area) rejest transfer from lsa7 to lsa5 and hence LO will only appear in areaX

MHM

williams-thomas
Level 1
Level 1

I get it, the filter-list will only filter LSA-3. In my case, the route is a TYPE 5

Hello
Because R3 is the ABR of the NSSA, you should be able to use a summary to filter

R3
----
router ospf x
summary-address 1.1.1.1 255.255.255.255 no-advertise


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Kind Regards
Paul