OSPF "area range" command summarizes only intra-area routes?

From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Sun Aug 26 2007 - 07:49:47 ART

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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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