From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Sun Aug 26 2007 - 11:35:02 ART
Hi Serhat,
I'm sorry I don't fully understand your points.
Without any area summarization, routers in Area 4 will learn all the
200.0.0.x/32 routes as inter-area routes.
I want to summarize all these host routes so that routers in Area 4 only see
200.0.0.0/24. I did it on the ABR (R4) using the "area 0 range 200.0.0.0
255.255.255.0" command.
However, Area 4 still sees 200.0.0.9/32. Why? As far as R4 is concerned, the
200.0.0.9/32 is an inter-area route whereas the other 200.0.0.x/32 are
intra-area routes.
Appreciate your further advice.
Thank you.
B.Rgds,
Lim TS
On 8/26/07, Serhat Aslan <serhatworks@gmail.com> wrote:
>
> Hi Toh,
> You made a wrong summarization. The steps of the summarizations are:
> 0. The areas must be originated with the specified ABR. This means
> intra-area routes.
> 1. Choosing an Area, (the routes must be originated with the same area)
> "area-range X"
> 2. Area Routes Aggregation, (IP subnet mask supernetting)
>
> You forgot to consider step1.
>
> Serhat Aslan
>
>
> On 8/26/07, Toh Soon, Lim <tohsoon28@gmail.com> wrote:
>
> > Hi Group,
> >
> > R4 is an ABR connected to Area 0 and Area 4. It learns the following
> > routes
> > in Area 0:
> >
> > Intra-area:
> > 200.0.0.2/32
> > 200.0.0.5/32
> > 200.0.0.6/32
> >
> > Inter-area:
> > 200.0.0.9/32
> >
> > I'm trying to summarize the above routes into Area 4, as follows:
> >
> > !
> > router ospf 1
> > area 0 range 200.0.0.0 255.255.255.0
> > !
> >
> > Routers in Area 4 see the summary address 200.0.0.0/24. All component
> > routes
> > are suppressed except for 200.0.0.9/32 which "leaks" into Area 4. E.g.
> >
> > O IA 200.0.0.9/32 [110/784] via 192.168.40.1, 00:21:02,
> > FastEthernet0/0
> > O IA 200.0.0.0/24 [110/2] via 192.168.40.1, 00:17:49,
> > FastEthernet0/0
> >
> >
> > I suspect the "area range" command only summarizes intra-area routes.
> > Can
> > anyone clarify this? I might be missing something here.
> >
> >
> > Thank you.
> >
> > B.Rgds,
> > Lim TS
> >
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