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Dell(conf)#router ospf 1
Dell(conf-router_ospf-1)#network 1.2.3.4/24 area 0
Dell(conf-router_ospf-1)#network 10.10.10.10/24 area 1
Dell(conf-router_ospf-1)#network 20.20.20.20/24 area 2
Dell(conf-router_ospf-1)#
Dell#
Dell Networking recommends using the interface IP addresses for the OSPFv2 router ID for easier
management and troubleshooting.
To view the configuration, use the show config command in CONFIGURATION ROUTER OSPF mode.
OSPF, by default, sends hello packets out to all physical interfaces assigned an IP address that is a subset
of a network on which OSPF is enabled.
To view currently active interfaces and the areas assigned to them, use the show ip ospf interface
command.
Example of Viewing Active Interfaces and Assigned Areas
Dell>show ip ospf 1 interface
TengigabitEthernet 12/17 is up, line protocol is up
Internet Address 10.2.2.1/24, Area 0.0.0.0
Process ID 1, Router ID 11.1.2.1, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DR, Priority 1
Designated Router (ID) 11.1.2.1, Interface address 10.2.2.1
Backup Designated Router (ID) 0.0.0.0, Interface address 0.0.0.0
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:04
Neighbor Count is 0, Adjacent neighbor count is 0
TengigabitEthernet 12/21 is up, line protocol is up
Internet Address 10.2.3.1/24, Area 0.0.0.0
Process ID 1, Router ID 11.1.2.1, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State BDR, Priority 1
Designated Router (ID) 13.1.1.1, Interface address 10.2.3.2
Backup Designated Router (ID) 11.1.2.1, Interface address 10.2.3.1
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:05
Neighbor Count is 1, Adjacent neighbor count is 1
Adjacent with neighbor 13.1.1.1 (Designated Router)
Dell>
Loopback interfaces also help the OSPF process. OSPF picks the highest interface address as the router-
id and a Loopback interface address has a higher precedence than other interface addresses.
Example of Viewing OSPF Status on a Loopback Interface
Dell#show ip ospf 1 int
TengigabitEthernet 13/23 is up, line protocol is up
Internet Address 10.168.0.1/24, Area 0.0.0.1
Process ID 1, Router ID 10.168.253.2, Network Type BROADCAST, Cost: 1
Transmit Delay is 1 sec, State DROTHER, Priority 1
Designated Router (ID) 10.168.253.5, Interface address 10.168.0.4
Backup Designated Router (ID) 192.168.253.3, Interface address 10.168.0.2
Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5
Hello due in 00:00:08
Neighbor Count is 3, Adjacent neighbor count is 2
Adjacent with neighbor 10.168.253.5 (Designated Router)
Adjacent with neighbor 10.168.253.3 (Backup Designated Router)
634
Open Shortest Path First (OSPFv2 and OSPFv3)