From: Tony Ng (tonyng42@xxxxxxx)
Date: Fri Dec 07 2001 - 15:21:53 GMT-3
To all,
in Fatkid's 462 lab, there's something within the solution I don't quite
understand.
R5 - FR cloud - R2
| * AREA 0
|(serial) * 10.0.0.0/16
-------------------------------------
| * AREA 1
| * 10.1.0.0/16
| * (ISDN connection)
|*
R3
Situation:
The solution states that summarization for Area 1 (10.1.0.0/16) should be
configured at both R5 & R2. R5, which has a serial connection to another
router in Area 1 (R3) will work great. R2, however, only has an ISDN
connection to this same router in Area 1 (R3) and it must have this BRI0
interface in Area 1.
Problem:
When summarization is configured in R2, the router inserts the summarized
route to null0, dropping the summarized route learned from R5. Hence, R2
can't get to any of the routes in Area 1 unless the ISDN is up.
Can anyone offer a better solution or clarify what I am missing here?
Thanks in advance!
without the "area 1 range 10.1.0.0 255.255.0.0" command:
10.0.0.0/8 is variably subnetted, 9 subnets, 4 masks
C 10.0.8.0/24 is directly connected, Serial0/0.103
C 10.1.9.0/24 is directly connected, Dialer0
C 10.0.9.0/24 is directly connected, Serial0/0.102
C 10.0.2.0/24 is directly connected, Loopback0
O 10.0.0.0/16 is a summary, 00:11:34, Null0
O IA 10.1.0.0/16 [110/65] via 10.0.9.5, 00:02:19, Serial0/0.102
with the "area 1 range 10.1.0.0 255.255.0.0" command:
10.0.0.0/8 is variably subnetted, 9 subnets, 4 masks
C 10.0.8.0/24 is directly connected, Serial0/0.103
C 10.1.9.0/24 is directly connected, Dialer0
C 10.0.9.0/24 is directly connected, Serial0/0.102
C 10.0.2.0/24 is directly connected, Loopback0
O 10.0.0.0/16 is a summary, 00:00:06, Null0
O 10.1.0.0/16 is a summary, 00:00:06, Null0
router ospf 4
area 0 range 10.0.0.0 255.255.0.0
area 1 range 10.1.0.0 255.255.0.0
area 1 stub
network 10.0.2.0 0.0.0.255 area 0
network 10.0.8.0 0.0.1.255 area 0
network 10.1.9.0 0.0.0.255 area 1
Regards,
Tony
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