Routes not exchanging between OSPF neighbors.

Hi Experts,

I am running OSPF between all the 3 routers using FR hub and spoke. R1 is the hub.

The neighborship is up.

R1#sh ip os neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
2.2.2.2           1   FULL/DR         00:01:41    10.0.0.2        Serial0/0
3.3.3.3           1   FULL/DROTHER    00:01:41    10.0.0.3        Serial0/0

R1 is getting routes from R2 and vice versa.

R1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets
C       1.1.1.0 is directly connected, Loopback0
     2.0.0.0/32 is subnetted, 1 subnets
O       2.2.2.2 [110/65] via 10.0.0.2, 00:03:03, Serial0/0
     4.0.0.0/32 is subnetted, 1 subnets
O       4.4.4.4 [110/65] via 10.0.0.2, 00:03:03, Serial0/0
     10.0.0.0/24 is subnetted, 1 subnets
C       10.0.0.0 is directly connected, Serial0/0

Networks 2.0.0.0/32 and 4.0.0.0/32 belong to R2.


But R1 is NOT getting routes R3 and viceversa.

If the shut the neighor R2, then routes will be exchanged between R1 and R3.

R2(config)#int s0/0
R2(config-if)#sh
R2(config-if)#
*Mar  1 13:43:31.340: %OSPF-5-ADJCHG: Process 100, Nbr 1.1.1.1 on Serial0/0 from FULL to DOWN, Neighbor Down: Interface down or detached
R2(config-if)#
*Mar  1 13:43:33.324: %LINK-5-CHANGED: Interface Serial0/0, changed state to administratively down
*Mar  1 13:43:34.324: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down

R1#
*Mar  1 13:45:15.124: %OSPF-5-ADJCHG: Process 100, Nbr 2.2.2.2 on Serial0/0 from FULL to DOWN, Neighbor Down: Dead timer expired

R1#sh ip route | b Gate
Gateway of last resort is not set

     1.0.0.0/24 is subnetted, 1 subnets
C       1.1.1.0 is directly connected, Loopback0
     3.0.0.0/32 is subnetted, 1 subnets
O       3.3.3.3 [110/65] via 10.0.0.3, 00:00:24, Serial0/0
     10.0.0.0/24 is subnetted, 1 subnets
C       10.0.0.0 is directly connected, Serial0/0

Now 3.0.0.0/32 which belongs to R3 is avilable in R1 table.

Can you guys please help me with this?

Krishna