/* The class AsClusterFatTree describes PGFT, as introduced by Eitan Zahavi
* in "D-Mod-K Routing Providing Non-Blocking Traffic for Shift Permutations
* on Real Life Fat Trees" (2010). RLFT are PGFT with some restrictions to
/* The class AsClusterFatTree describes PGFT, as introduced by Eitan Zahavi
* in "D-Mod-K Routing Providing Non-Blocking Traffic for Shift Permutations
* on Real Life Fat Trees" (2010). RLFT are PGFT with some restrictions to