---------------
       | Native      |                   |  [ ] TE Node
       | TE Topology |                   |  +++ TE Link
       ---------------                   o--------------

   [R1] ++++ [R2] ++++ [R3] ++++ [R4] ++++ [R5]
     +                +    +    +    +    +
     +               +      +  +      +  +
     +              +        ++        ++
   [R6] +++++++++ [R7]      [R8] ++++ [R9]