.. code-block:: json

    { "ospf": { "external": {} } }

+------------------+------------------------------------------------------------------+
| Attribute        | Description                                                      |
+==================+==================================================================+
| **purge**        | | Automatically purge all external LSA during teardown.          |
|                  | | Default: true                                                  |
+------------------+------------------------------------------------------------------+
| **mrt-file**     | | OSPF MRT file.                                                 |
+------------------+------------------------------------------------------------------+