From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Mon Sep 10 2007 - 23:03:14 ART
Hi NET HE,
Thanks for your reply.
I have never tried configuring "area X nssa default-information-originate"
on an internal router (non-ABR) in an NSSA. When used on the ABR, it
unconditionally sources an N2 default route into the NSSA by default. If
applied on an internal router in the NSSA, does the router have to have a
default route (static route or learned from other IGP) in order to inject
the Type-7 default?
Thank you.
B.Rgds,
Lim TS
On 9/11/07, NET HE <he_net@hotmail.com> wrote:
>
> In addition, cmd "area 23 nssa no-summary" can only be used at ABR
> routers,
> but cmd "area 23 nssa defalut-information-originate" can be used at ABR
> routers or ASBR routers, which are located in NSSA area, and inject type-7
> LSA.
>
>
> Best Regards,
> Net (Xin) He
>
> >X-OriginalArrivalTime: 10 Sep 2007 23:08:20.0266 (UTC)
> >FILETIME=[7A9CE0A0:01C7F3FF]
> >
> >with the "no-summary" option, the ABR will inject a default route and
> >it will also block all LSA type 3s, therefore, the routers in the NSSA
> area
> >will NOT see the inter-area routes. But with the "default-information"
> >keyword, the ABR will inject a default route but it won't block LSA type
> 3s
> >and as a result of that the routers within the NSSA area will still
> >maintain
> >LSA type 3s (Inter-Area routes).
> >
> >On 9/10/07, Carlos Trujillo Jimenez <nergal888@hotmail.com> wrote:
> > >
> > > Hi all.
> > >
> > > I have a NSSA area, the routers from the NSSA dont need reachability
> > > information about the external prefixes, that means I must inject a
> > > default
> > > route for the external prefixes reachability.
> > >
> > > I have two options to do it.
> > >
> > > at the area border router:
> > >
> > > area 23 nssa no-summary
> > >
> > > or
> > >
> > > area 23 nssa defalut-information-originate
> > >
> > > Is there any significant difference between both options?? both
> works,
> >by
> > > a
> > > show ip route at the internal routers of the nssa area I can see an
> > > external
> > > IA default route with both commands, theres is no difference, any
> ideas
> > > when
> > > one of these options can and cannot be used???
> > >
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