spanning tree portfast settings for PXE booting

In continuation to the previous page on Mirantis Fuel --  while we were setting up openstack  on HP DL 380 G7s  using Fuel - we observed that the nodes were timing out on DHCP during the PXE booting --  as with any Linux Kickstarts we recalled to set 'spanning-tree portfast ' on the cisco switch port use for PXE on the node - and we could resolve the timeout issues

Cheers!!