|                 |
                             | +---+          ---
                             | |   | TE Node  \ / Transitional
                             | +---+           |  Link
                             |
                             | ----- Client-Layer Link
                             | ===== Server-Layer Link
                             | ***** Layer Boundary
                             o----------------------------------

   +-------------------+
   | +-------+         |                          +-------+
-----|Client-|------+  |             Client- -----|Client-|
   | |Layer  |---+  |  |             Layer        |Layer  |
-----|Switch |-+ |  |  |             Links   -----|Node   |
   | +------ + | |  |  |                          +-------+
   |           | |  |  | Client                    | |  |
   |           | | ---_| Layer                     --- ---
***|***********|*| \ /*|***************************\ /*\ /****
   |           ---  |  | Server       Transitional  |   |
   |    Layer  \ /  |  | Layer               Links  |   |
   |    Term.   |   |  |                            |   |
   |            |   |  |                            |   |
   |         +-------+ |                          +-------+
=============|Server-|=====           Server- ====|Server-|====
   |         |Layer  | |              Layer       |Layer  |
=============|Switch |=====           Links   ====|Node   |====
   |         +-------+ |                          +-------+
   +-------------------+

    Physical Node View                       TE Topology View