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OSPF Interface Level Area Assignment

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Published on Apr 13, 2011

Each interface running OSPF needs to be assigned to an OSPF area. There are actually two ways to accomplish this. In this lesson we will look at the interface level command (ip ospf area). There is another lesson that looks at accomplishing this using the OSPF network area routing process level command.

The OSPF ip ospf area interface level command allows you to assign a single interface to an OSPF area. This gives you the advantage of configuring an OSPF area on an interface by interface basis. The OSPF ip ospf area interface level command is a (relatively) newer command and may not be available on older IOS versions (pre 12.3(11)). Unlike the network area routing process level command, this frees you from using a combination of network address and wildcard bits to create an IP address range to match interfaces. It also allows you to change the IP address of an OSPF enabled interface without having to configure a new IP address range under the routing process.

When configuring the ip ospf area command, if you have not already configured the OSPF process, IOS will create the process for you. Be careful that you do not put in an incorrect OSPF process number, or you will end up with multiple OSPF processes running on your device.

If the ip ospf area command is configured on an interface and that interface IP address matches a routing process level network area statement, the interface level ip ospf area command takes precedence.

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