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Hierarchy Level


Specify the area identifier for this routing device to use when participating in OSPF routing. All routing devices in an area must use the same area identifier to establish adjacencies.

Specify multiple area statements to configure the routing device as an area border router. An area border router does not automatically summarize routes between areas. Use the area-range statement to configure route summarization. By definition, an area border router must be connected to the backbone area either through a physical link or through a virtual link. To create a virtual link, include the virtual-link statement.

To specify that the routing device is directly connected to the OSPF backbone, include the area statement.

All routing devices on the backbone must be contiguous. If they are not, use the virtual-link statement to create the appearance of connectivity to the backbone.

You can also configure any interface that belongs to one or more topologies to advertise the direct interface addresses without actually running OSPF on that interface. By default, OSPF must be configured on an interface in order for direct interface addresses to be advertised as interior routes.


If you configure an interface with the passive statement, it applies to all the topologies to which the interface belongs. You cannot configure an interface as passive for only one specific topology and have it remain active for any other topologies to which it belongs.


area-id—Area identifier. The identifier can be up to 32 bits. It is common to specify the area number as a simple integer or an IP address. Area number is reserved for the OSPF backbone area.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced before Junos OS Release 7.4.

Support for the realm statement introduced in Junos OS Release 9.2.

Support for the realm statement introduced in Junos OS Release 9.2 for EX Series switches.

Support for the no-eligible-remote-backup statement introduced in Junos OS Release 15.1.