| +---+
                             | |   | TE Node
                             | +---+
                             | ----- TE Link
                             o----------------------------------

  +---+       +---+        +---+         +---+         +---+
  | R1|-------| R2|--------| R3|---------| R4|---------| R5|
  +---+       +---+        +---+         +---+         +---+
    |                      /   \         /   \         /
    |                     /     \       /     \       /
    |                    /       \     /       \     /
    |                   /         \   /         \   /
    |                  /           \ /           \ /
  +---+             +---+         +---+         +---+
  | R6|-------------| R7|         | R8|---------| R9|
  +---+             +---+         +---+         +---+