From: Chua, Parry (Parry.Chua@xxxxxxxxxx)
Date: Wed Feb 06 2002 - 00:41:25 GMT-3
Hi,
NSSA is not a totally Stubby area, in your config, R5 is the asbr and
abr and there is no
config to stop type 7 within the area 1 (R5, R1), so R1 will revice the
type 7 from R5.
You can config in R5 with area 1 nssa no-redistribution, this will
prevent type 7
from getting to R1.
For detail, see www.cisco.com/wrap/customer/104/nssa.html
Parry Chua
-----Original Message-----
From: Greg Sporton [mailto:greg.sporton@nec.com.au]
Sent: Wednesday, February 06, 2002 10:11 AM
To: ccielab@groupstudy.com
Subject: OSPF Totally Stubby Area
Hi all,
I've got a funny situation with OSPF Redistribution and OSPF Totally
Stubby Areas. My routers are connected as below:
R5-------R6
| |
| |
R1 R2
Area 0 Between R5 and R6.
Area 1 Between R1 and R5.
Area 2 Between R6 and R2.
I have created a loopback interface on R5 and placed it into RIP. I then
redistribute RIP into OSPF. Both Area 1 and 2 are configured as Totally
Stubby Areas as show below:
R1:
router ospf 1
area 1 nssa
network 192.168.1.1 0.0.0.0 area 1
R5:
router ospf 1
area 1 nssa no-summary
redistribute rip metric 200 metric-type 1 subnets
network 192.168.0.1 0.0.0.0 area 0
network 192.168.1.2 0.0.0.0 area 1
R6:
router ospf 1
area 2 nssa no-summary
network 192.168.0.2 0.0.0.0 area 0
network 192.168.2.2 0.0.0.0 area 2
R2:
router ospf 1
area 2 nssa
network 192.168.2.1 0.0.0.0 area 2
The routing table on R2 looks as I would expect:
C 192.168.2.0/24 is directly connected, Serial0/0.1
O*IA 0.0.0.0/0 [110/391] via 192.168.2.2, 01:15:10, Serial0/0.1
But looking at R1, I can't understand why the NSSA Type 1 route is
appearing in the routing table:
O N1 10.0.0.0/8 [110/590] via 192.168.1.2, 00:18:26, Serial0/0.1
C 192.168.1.0/24 is directly connected, Serial0/0.1
O*IA 0.0.0.0/0 [110/391] via 192.168.1.2, 00:18:26, Serial0/0.1
>From my understanding a Totally Stubby Area should not inject any
External routes into the Area but the 10.0.0.0 network is in the OSPF
Database as a Type 7 LSA. Any ideas why I am still seeing this route?
Regards,
Greg.
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