all:
  children:
    skylake: # Architecture: (options) skylake, haswell, taishan...
      children:
        tg:
          hosts:
            1.1.1.1: null #t1-tg
        sut:
          hosts:
            2.2.2.2: null #t1-sut1
            3.3.3.3: null #t1-sut2