Hi, i am studying for my CCNA exam and using packet tracer i have designed a network as configured below. OSPF works fine meaning i can ping all devices from any network. however, if i remove a serial interface from any router there is no fail over (redundancy) meaning i cannot ping all devices anymore. Doesn't OSPF provide redundancy? Is my configuration wrong ? Please help. Thank you
Anil
Trinidad and Tobago
Router1
interface GigabitEthernet0/1
ip address 192.168.1.1 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0/0
ip address 10.1.3.2 255.255.255.0
!
interface Serial0/0/1
ip address 10.1.1.1 255.255.255.0
!
interface Vlan1
no ip address
shutdown
!
router ospf 1
log-adjacency-changes
network 192.168.1.1 0.0.0.0 area 1
network 10.1.1.1 0.0.0.0 area 1
network 10.1.3.4 0.0.0.0 area 1
Router2
interface GigabitEthernet0/1
ip address 10.1.4.1 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0/0
ip address 10.1.3.1 255.255.255.0
!
interface Serial0/0/1
ip address 10.1.2.2 255.255.255.0
!
interface Vlan1
no ip address
shutdown
!
router ospf 1
log-adjacency-changes
network 10.1.4.1 0.0.0.0 area 1
network 10.1.3.1 0.0.0.0 area 1
network 10.1.2.2 0.0.0.0 area 1
Router3
interface GigabitEthernet0/1
ip address 172.16.110.1 255.255.255.0
duplex auto
speed auto
!
interface GigabitEthernet0/2
no ip address
duplex auto
speed auto
shutdown
!
interface Serial0/0/0
ip address 10.1.1.2 255.255.255.0
!
interface Serial0/0/1
ip address 10.1.2.1 255.255.255.0
!
interface Vlan1
no ip address
shutdown
!
router ospf 1
log-adjacency-changes
network 172.16.110.1 0.0.0.0 area 1
network 10.1.1.2 0.0.0.0 area 1
network 10.1.2.1 0.0.0.0 area 1
