Inside Area

               +--------+                 +--------+
               | Inside |-----------------| Inside |
               | Router |                 |  Edge  |
               +--------+    +------------| Router |
                   |        /             +--------+
                   |       /                   |
               +--------+ /       =============|======
               | Area   |/        ||           |
               | Leader |         ||      +---------+
               +--------+         ||      | Outside |
                                  ||      |  Edge   |
                                  ||      | Router  |
                                  ||      +---------+

                                          Outside Area