From: Brian Edwards (bedwards@xxxxxxxxxxx)
Date: Tue Aug 29 2000 - 20:40:28 GMT-3
There are a bunch of different ways to configure NSSA. NSSA and stub are
mutually exclusive (you can't configure an area as a stub and a NSSA).
1.) You want Inter-Area routes in your NSSA, and do not want externals
redistributed in by ASBR in other areas to be reachable.
ABR:
router ospf 1
area 1 nssa
Internal routers in the NSSA:
router ospf 1
area 1 nssa
2.) You want Inter-Area routes in your NSSA, and a default-route for
externals redistributed in by ASBR in other areas.
ABR:
router ospf 1
area 1 nssa default-information-originate
Internal routers in the NSSA:
router ospf 1
area 1 nssa
3.) You do not want Inter-Area routes in your NSSA. You want a default-route
to provide connectivity to externals redistributed in by ASBR in other areas
and Inter-Area routes.
ABR:
router ospf 1
area 1 nssa no-summary
! "default-information-originate" is automagically turned on with
"no-summary"
Internal routers in the NSSA:
router ospf 1
area 1 nssa
My question is... Why don't you need a gateway of last resort (or and
"always" tag) on the ABR in order to default-information-originate?
-----Original Message-----
From: Aaron DuShey [mailto:aaron.dushey@dushey-consulting.com]
Sent: Tuesday, August 29, 2000 4:08 PM
To: 'jim beam'; pborghese@groupstudy.com
Cc: ccielab@groupstudy.com
Subject: RE: NSSA in OSPF
see page 538 of Doyle's routing TCP-IP
quote "area x nssa no-summary"
"To turn area into a somewhat schizophrenically named ""totally stubby
not-so-stubby"" area
This command eliminates all inter-area routes and adds a default from the
ABR
Aaron DuShey-GE Capital Net Solutions
Consulting Systems Engineer
(760)500-1707-Cellular
(877)470-0273-Office
CCNP Voice/Security Specialist - CNX - MCSE - CNE 5 - Citrix CA - ASE- HP
Star
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
jim beam
Sent: Tuesday, August 29, 2000 2:28 PM
To: pborghese@groupstudy.com
Cc: ccielab@groupstudy.com
Subject: Re: NSSA in OSPF
I'm not sure about your problem with "no-summary" but I know that an area
can't be defined as both stub and NSSA...The point of NSSA is that the area
is inherently stub, but it will allow type 7 LSA's to pass through to
advertise about other autonomous systems.
Jack Heney
CCNP
>From: "Paul Borghese" <pborghese@groupstudy.com>
>Reply-To: "Paul Borghese" <pborghese@groupstudy.com>
>To: "Lawrence Dwyer" <dwyer@tatrc.org>
>CC: <ccielab@groupstudy.com>
>Subject: Re: NSSA in OSPF
>Date: Tue, 29 Aug 2000 16:47:37 -0400
>
>I do not believe this will work (but it might I am not in front of a
>router)
>
>area 1 stub
>area 1 nssa
>
>
>Paul
>----- Original Message -----
>From: "Lawrence Dwyer" <dwyer@tatrc.org>
>To: "Paul Borghese" <paul98@prodigy.net>
>Cc: <ccielab@groupstudy.com>
>Sent: Tuesday, August 29, 2000 4:33 PM
>Subject: Re: NSSA in OSPF
>
>
> > Did you define the area as a stub first?
> > Larry
> >
> > Paul Borghese wrote:
> >
> > > Ok, this is driving me crazy. If I setup a network as an NSSA area
>using
> > > the command:
> > >
> > > area 1 nssa
> > >
> > > a default route does not get propagated by the ABR. If I enter the
> > > command -
> > >
> > > area 1 nssa no-summary
> > >
> > > a default route does get propagated into the NSSA. But Inter-Area
>routes
> > > are also propagated into the area. You would think the no-summary
>command
> > > would operate similar to that of "area 1 stub no-summary" and not
>allow
>IA
> > > routes.
> > >
> > > Plus the no-summary command under nssa is not documented in either the
>11.3
> > > or 12.1 documentation.
> > >
> > > Ok, so what is going on? What am I missing?
> > >
> > > Paul Borghese
> > >
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