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selectively redistribute in some OSPF areas, not all

gnijs
Enthusiast
Enthusiast

Hello,

I might have a strange question: is it possible to selectively redistribute into an area when your router has multiple areas ??
Let me explain: we have a NSSA area composed of 4 routers: lets say routers A and B connect to the backbone area 0.0.0.0, router C & D have a RIP/static/EIGRP connection and redistribute some (very limited) routes into the NSSA (hence NSSA).
However, recently we have started to deploy BGP additionally on our core routers A and B. They receive BGP routes and redistribute them into the backbone. However, by default, they ALSO push (all) these routes into the NSSA area, which i in fact don't want and which is not needed (since A & B already put a default into the NSSA area by design).
Is there a way to prevent this from happening ?

Probably area filter ?

area NSSA filter-list prefix DEFAULT out 

or something like that.....

4 Replies 4

OSPF: Area range vs Summary address | IPNET
two command you have 
area range
summary address 
check link above and see which option is suitable for you.
thanks 
MHM