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OSPF NSSA with upstream STUB?

pashdown1
Level 1
Level 1

I'd like to use OSPF NSSA in order to redistribute static routes into OSPF, but all I want from the upstream is the default route, like what I would get if I was using STUB.  I tried connecting NSSA to STUB in this manner:

Upstream:

router ospf 100

area 200 stub no-summary

[networks deleted]

Downstream:

router ospf 100

redistribute static subnets

redistribute connected subnets

area 200 nssa

[networks deleted]

It didn't work.  Do both sides of the link need to be the same?  Ie: stub/stub, nssa/nssa?

2 Replies 2

Richard Burts
Hall of Fame
Hall of Fame

Yes the routers must configure area 200 as the same kind of area.

HTH

Rick

Sent from Cisco Technical Support iPad App

HTH

Rick

Giuseppe Larosa
Hall of Fame
Hall of Fame

Hello Pete,

in order to build a successful OSPF adjacency the routers must agree on area type.

The area type is mapped in flag bits that are present in OSPF hello packets so the mismatch is easily detected.

In your case you need to use area 200 nssa on both routers.

Hope to help

Giuseppe

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