From: Serhat Aslan (serhatworks@gmail.com)
Date: Sun Aug 26 2007 - 10:28:39 ART
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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