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

  +---+              +---+
  |S3 |              |S5 |
  +---+\           / +---+
        \         /
         \       /
          \+---+/                +---+
          /|AN1|\----------------|S8 |
         / +---+ \               +---+
  +---+ /         \ +---+
  |S9 |             |S11|
  +---+             +---+
        Abstract TE Topology

         +---+                    +---+
         |S1 |--------------------|S2 |
         +---+                    +---+
          /                          \
         /                            \
  +---+ /                  +---+       \ +---+
  |S3 |--------------------|S4 |---------|S5 |
  +---+\                   +---+         +---+
        \                      \             \
         \                      \             \
          \+---+                 +---+         +---+
          /|S6 |\                |S7 |---------|S8 |
         / +---+ \               +---+\       /+---+
  +---+ /         \ +---+              +---+ /
  |S9 |-------------|S10|--------------|S11|/
  +---+             +---+              +---+
        Native TE Topology