• Enable OSPFv2 on an interface and assign a network address range to a specific OSPF area.CONFIG-ROUTER-OSPF-id modenetwork ip-address mask area area-idThe IP Address Format is A.B.C.D/M.The area ID range is from 0 to 65535 or A.B.C.D/M.Enable OSPFv2 on InterfacesEnable and configure OSPFv2 on each interface (configure for Layer 3 protocol), and not shutdown.You can also assign OSPFv2 to a Loopback interface as a virtual interface.OSPF functions and features, such as MD5 Authentication, Grace Period, Authentication Wait Time, are assigned on a per interface basis.NOTE: If using features like MD5 Authentication, ensure all the neighboring routers are also configured forMD5.In the example below, an IP address is assigned to an interface and an OSPFv2 area is defined that includes the IP address of a Layer 3interface.The first bold lines assign an IP address to a Layer 3 interface, and theno shutdown command ensures that the interface is UP.The second bold line assigns the IP address of an interface to an area.Example of Enabling OSPFv2 and Assigning an Area to an InterfaceDell#(conf)#int te 4/14Dell(conf-if-te-4/14)#ip address 10.10.10.10/24Dell(conf-if-te-4/14)#no shutdownDell(conf-if-te-4/14)#exDell(conf)#router ospf 1Dell(conf-router_ospf-1)#network 1.2.3.4/24 area 0Dell(conf-router_ospf-1)#network 10.10.10.10/24 area 1Dell(conf-router_ospf-1)#network 20.20.20.20/24 area 2Dell(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 isenabled.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 AreasDell>show ip ospf 1 interfaceTenGigabitEthernet 1/17 is up, line protocol is upInternet Address 10.2.2.1/24, Area 0.0.0.0Process ID 1, Router ID 11.1.2.1, Network Type BROADCAST, Cost: 1Transmit Delay is 1 sec, State DR, Priority 1Designated Router (ID) 11.1.2.1, Interface address 10.2.2.1Backup Designated Router (ID) 0.0.0.0, Interface address 0.0.0.0Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5Hello due in 00:00:04Neighbor Count is 0, Adjacent neighbor count is 0TenGigabitEthernet 1/21 is up, line protocol is upInternet Address 10.2.3.1/24, Area 0.0.0.0632 Open Shortest Path First (OSPFv2 and OSPFv3)
