[c-nsp] OSPF NSSA Question

Brian Feeny signal at shreve.net
Sun Oct 3 18:22:27 EDT 2004

Perhaps post your config.

On the access routers  you want something like this.  Assuming area 10
is the access router area/nssa:

router ospf 10
  area 10 nssa
  redistribute connected subnets
  redistribute static subnets
  network x.x.x.x x.x.x.x  area 10

And on the distribution router you want something like this:

router ospf 10
  area 10 nssa default-information-originate
  redistribute connected subnets
  redistribute static subnets
  network x.x.x.x x.x.x.x  area 0
  network x.x.x.x x.x.x.x  area 10

Be sure your interfaces are being put in the correct areas.


On Oct 3, 2004, at 5:10 PM, Dan Armstrong wrote:

> I am tearing my hair out here with an NSSA problem, any help is 
> appreciated:
> Say I have a distribution layer router, that is connected to it's 
> backbone
> with OSPF in area 0.
> I have a whack-O-Access routers, each access router in a different 
> connecting to a different interface on the distribution layer router.
> Customer's IP blocks get anchored on the access routers, and my 
> purpose for
> using a routing protocol here is to get the IP blocks (which are C 
> routes on
> the access routers)  advertised up into the dist router, and on up 
> into the
> backbone.
> The only way anything can leave the access router is via the 
> distribution
> router, so I decided to make a stub area (nssa actually) for all the 
> access
> routers.  The access router only needs a default advertised, and life 
> is
> good.
> For some reason, I am missing, OSPF is advertising every little stupid 
> block
> on every access router to every other access router, via the 
> distribution
> router.  All I need is the default route, why does OSPF insist on 
> advertising
> all these blocks?  Isn't the whole point of a stub area to be able to 
> prevent
> a million specific prefixes from being advertised into it and add a 
> simple
> default route if a router only has 1 exit point?
> _______________________________________________
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Brian Feeny, CCIE #8036, CISSP
Network Engineer
ShreveNet Inc.

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