You need to configure the same summary address on both routers for the Area you are summarising into Area 0 and optionally the Area 0 addresses you are summarising into Area x:
The below config shows a router with 3 areas 0, 1 & 2, Area 0 has been assigned an address block of 10.1.0.0/16, Area 1 has been assigned an address block of 10.100.0.0/16 and Area 2 has been assigned an address block of 10.200.0.0/16, all three Area addresses are being summarised.
router ospf 1
network 10.1.1.0 0.0.0.255 area 0.0.0.0
network 10.100.1.0 0.0.0.255 area 0.0.0.1
network 10.200.1.0 0.0.0.255 area 0.0.0.2
area 0 range 10.1.0.0 255.255.0.0
area 1 range 10.100.0.0 255.255.0.0
area 2 range 10.200.0.0 255.255.0.0
The Area Range statements should be the same on both ABR's
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