From: NET HE (he_net@hotmail.com)
Date: Tue Sep 11 2007 - 00:42:38 ART
- ASBR does need have a default route first, then inject type-7 default
route into NSSA area. And depends on metric-type, it can be N1 or N2. (nssa
default-information originate)
- ABR unconditionally inject a default route using "nssa default-information
originate), it is a type-7 LSA as well.
- ABR unconditionally inject a default route using "nssa no-summary", but it
is a type-3 LSA.
Best Regards,
Net (Xin) He
>X-OriginalArrivalTime: 11 Sep 2007 02:07:27.0120 (UTC)
>FILETIME=[803CA900:01C7F418]
>
>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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