07-17-2009 01:48 PM - last edited on 03-25-2019 03:25 PM by ciscomoderator
I have 3 routers in three areas.
R1 ---> Area 0
R2 ---> Area 0 and 1 (ABR)
R3 ---> Area 1.
R2 is connected to R3 (in area 1)through a FR,with 'ip ospf net point-to-point' configured. I try to filter inter- area routes from area 0 from entering area 1 by applying the below command at the serial interface of R2 connecting to R3....'ip ospf database-filter all out'. Bur I am still seeing the IA routes. Please whats the reason.
07-18-2009 04:03 AM
about your command database-filter
i think its not the best choice for your case
becuase, if there are two links between OSPF neighbors, this command can be used to prevent the flooding of LSAs on one of the links
in addition you using ospf network type as p2p
however, This command can be used only on a multipoint interface or an NBMA interface
ok to solve this issue easlly i would suggest you to do the following commnads ( which will let you filter area 0 routes and send only default route to r3)using totally stubby area of ospf
on r2
area 1 stub
area 1 stub no summary
on r3
area 1 stub
now router3 will see area 1 routes and default routes point to r2 link
good luck
if helpful Rate
07-18-2009 04:18 AM
Hello Kennie,
in addition to what Marwan sugests for inter-area filtering you should use
router ospf 10
area area# filter-list prefix-list-name in|out
command that allows to invoke a prefix-list inside the routing process on ABR.
the command you have tried to use is not the right tool here.
in your case
area 1 filter-list only_these in
or
area 0 filter-list only_these out
can do the job
Hope to help
Giuseppe
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