Re: OSPF NSSA redistribution

From: Kari Asheim (ka@nextel.no)
Date: Fri Jun 02 2000 - 03:00:12 EDT


On Fri, Jun 02, 2000 at 07:06:34AM +0200, Dmitri Kalintsev wrote:
> On Thu, Jun 01, 2000 at 07:11:36AM -0400, Robert Kiessling wrote:

> > 1. both routers announce the summary 10.0.0.0/24 to area 0
> >
> > 2. both router announce the individual host routes like 10.0.0.1/32
> > to each other.
> >
> > Is this possible?
>
> router ospf xyz
> area <your area number> range 10.0.0.0 255.255.255.0
>
> on your ABR(s).
>
> > Using the naive approach os "summary-address" does not work since in
> > that case the routes are summarised to the NSSA area, too.
>
> "summary-address" is meant to be used on ASBR's, not between areas.

It is not really possible to tell from the documentation whether you
can use summary-address on an ABR.

I use both on an ABR, and I see that:

- area range summarizes routes learnt via OSPF (type 3 in my network).

- summary-address summarizes what is redistributed into OSPF by
  all routers in the area. This includes the type 7 routes that comes
  from other routers in the area redistributing static routes into OSPF.

Kari

-- 
Kari Asheim                                      Kari.Asheim@nextra.com
Nextra AS                                        +47 22 77 19 47
P.O.Box 393, Sk°yen
0212 Oslo



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