Administrator Guide

You can assign the area in the following step by a number or with an IP interface address.
• Enable OSPFv2 on an interface and assign a network address range to a specic OSPF area.
CONFIG-ROUTER-OSPF-id mode
network ip-address mask area area-id
The 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 Interfaces
Enable and congure OSPFv2 on each interface (congure 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 congured for MD5.
In the following example, an IP address is assigned to an interface and an OSPFv2 area is dened that includes the IP address of a
Layer 3 interface.
The rst 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 Interface
Example of Viewing Active Interfaces and Assigned Areas
Example of Viewing OSPF Status on a Loopback Interface
Dell#(conf)#int tengig 4/44
Dell(conf-if-te-4/44)#ip address 10.10.10.10/24
Dell(conf-if-te-4/44)#no shutdown
Dell(conf-if-te-4/44)#ex
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 conguration, 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.
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
548
Open Shortest Path First (OSPFv2 and OSPFv3)