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Enable OSPF on the device

When you enable OSPF on the device, the protocol is automatically activated. To enable OSPF on the

device, use the following method.

device(config)# router ospf

device(config-ospf-router)#

This command launches you into the OSPF router level where you can assign areas and modify

OSPF global parameters.

Note regarding disabling OSPF

If you disable OSPF, the device removes all the configuration information for the disabled protocol

from the running configuration. Moreover, when you save the configuration to the startup configuration

file after disabling one of these protocols, all the configuration information for the disabled protocol is

removed from the startup configuration file.

The CLI displays a warning message such as the following.

device(config-ospf-router)# no router ospf

router ospf mode now disabled. All ospf config data will be lost when writing to

flash!

If you have disabled the protocol but have not yet saved the configuration to the startup configuration

file and reloaded the software, you can restore the configuration information by re-entering the router

ospf command to enable the protocol. If you have already saved the configuration to the startup

configuration file and reloaded the software, the information is gone.

If you are testing an OSPF configuration and are likely to disable and re-enable the protocol, you might

want to make a backup copy of the startup configuration file containing the protocol’s configuration

information. This way, if you remove the configuration information by saving the configuration after

disabling the protocol, you can restore the configuration by copying the backup copy of the startup

configuration file onto the flash memory.

Assign OSPF areas

Once OSPF is enabled on the system, you can assign areas. Assign an IP address or number as the

area ID for each area. The area ID is representative of all IP addresses (subnets) on a router port.

Each port on a router can support one area.

An area can be normal, a stub, or a Not-So-Stubby Area (NSSA) :

• Normal - OSPF routers within a normal area can send and receive External Link State

Advertisements (LSAs).

• Stub - OSPF routers within a stub area cannot send or receive External LSAs. In addition, OSPF

routers in a stub area must use a default route to the area’s Area Border Router (ABR) or

Autonomous System Boundary Router (ASBR) to send traffic out of the area.

• NSSA - The ASBR of an NSSA can import external route information into the area.

‐ ASBRs redistribute (import) external routes into the NSSA as type 7 LSAs. Type-7

External LSAs are a special type of LSA generated only by ASBRs within an NSSA, and

are flooded to all the routers within only that NSSA.

‐ ABRs translate type 7 LSAs into type 5 External LSAs, which can then be flooded

throughout the AS. You can configure address ranges on the ABR of an NSSA so that the

ABR converts multiple type-7 External LSAs received from the NSSA into a single type-5

External LSA.

Enable OSPF on the device

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