topo: vecmd [-Nh] topo [control] [option]
  A VE card composition information list on the hosts is indicated.

  option
   -N           VE_no is directed.
   -h           help is indicated.

  parameter
   control:
     MATRIX     show the composion of ve-card by matrix-format
     TREE       show the composion of ve-card by tree-format
     ROUTE      show the pci route of ve-cards
     PCI        show the pci infomation of ve-cards
 
   option:
     -h        distance in MATRIX by hops.
     -r        distance in MATRIX by route.
     -v        pci-info in PCI by more detail.
     -x        pci-info in PCI by config value.

  end status
   Success:
   Failed:      Type miss
