Basic OSPF configuration in multi-area

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Example configuration of OSPF in multi area
Sure, here's an example configuration for Open Shortest Path First (OSPF) in a multi-area network using Cisco IOS syntax:

router ospf [process ID]
 network [area IP address] [wildcard mask] area [area ID]
area [area ID] range [area IP address] [area subnet mask]

In this example, [process ID] should be replaced with a number that uniquely identifies the OSPF process on the router. [area IP address] should be replaced with the IP address of the network that belongs to the OSPF area, and [wildcard mask] should be replaced with the wildcard mask for the network. [area ID] should be replaced with the ID of the OSPF area.

Here's a breakdown of what each line in the configuration example does:

router ospf [process ID]:This command enters OSPF configuration mode and sets the process ID for the router.
network [area IP address] [wildcard mask] area [area ID]: This command specifies that the specified network belongs to the specified OSPF area. [area IP address] is the IP address of the network that belongs to the OSPF area, and [wildcard mask] is the wildcard mask for the network. [area ID] is the ID of the OSPF area.

area [area ID] range [area IP address] [area subnet mask]: This command specifies a summary route for the specified area. [area ID] is the ID of the OSPF area, and [area IP address] and [area subnet mask] define the summary route for the area.
Note that this is just a basic example, and there are many other OSPF configuration options and settings that can be configured based on your specific network requirements.

Also, keep in mind that proper design is required when setting up multi-area OSPF, as the correct placement of ABRs is critical to ensure proper routing behavior.