+----------  VPLS "1543" ----------+
                                                           
                  +-----+   +--------------+   +-----+    
      +----+      | PE1 |===|              |===| PE2 |       +----+
      | CE1 +-----+"450"|   |     MPLS     |   |"451"+-------+ CE2|
      +----+      +-----+   |              |   +-----+       +----+
                            |     Core     |                 
                            +--------------+