Enabling OSPFv2

You can create OSPFv2 interfaces in the following ways:

• You can issue the network area command, which creates OSPF interfaces for all IP interfaces with IP addresses within the specified range.
• You can issue the address area command, which creates an OSPF interface in the specified area that sits on top of the IP interface at the given IP address (or on the unnumbered interface, if that is specified).

  Note: Do not enable OSPF on any unidirectional interfaces (such as an MPLS tunnel), because it can never form an adjacency.

You can delete OSPFv2 interfaces in the following ways:

• You can issue the no network area command, which deletes all OSPF interfaces within the specified range.
• If the OSPF interface was created with the address area command, you can issue the no address area command to delete the specified interface.
• You can issue the no ip address command to delete the IP interface associated with the OSPF interface and also the OSPF interface itself.

  Note: If an OSPF interface is configured on top of an IP interface and you delete the IP interface, the corresponding OSPF interface is also deleted. The previously configured network range, however, is not deleted. You must issue the no network area command to delete the range.

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