[c-nsp] OSPF NSSA question

[Laurent Geyer]

On Wed, Jul 22, 2009 at 4:13 PM, Ruben Alvarez<raa at opusnet.com> wrote:
>
> " A stub area is an area which does not receive external route
> advertisements. It may be configured to reduce many route advertisements
> into an area when the routing table consists of mostly external routes.
> Instead of the external routes, a default route is advertised to the stub
> area. A stub area has only one OSPF router, cannot contain an AS boundary
> router (ASBR) and routes cannot be distributed from other protocols into the
> stub area."
>
> Can someone confirm that?
>
> Thanks all.

Like Jon mentioned, you cannot redistribute connected and statics into
OSPF from a totally stubby area.

If your main concern with your NSSA right now are the external routes
that are being advertised into your NSSA from the ABR, you can
eliminate those advertisements by disabling redistribution.

On the ABR:

router ospf <process>
  area 1 nssa no-redistribution no-summary

- Laurent